Project Tag: Machining and Manufacturing

No. 9,309,925 | High Speed Machining Center

No. 9,309,925 | High Speed Machining Center A micro-machine powered by an electric motor and/or a gas turbine drive and capable of rotation speeds to 1,500,000 rpm is disclosed. The micro-machine may include a rotating spindle which is constructed, balanced and arranged to provide a tool holder function and may incorporate a portion of the […]

Ultra-High-Speed Micro-Milling of Aluminum Alloy

Jahanmir, S., Tomaszewski, M.J. and Heshmat, H., “Ultra-High-Speed Micro-Milling of Aluminum Alloy.” ASME International Mechanical Engineering Congress and Exposition Proceedings, 15 (2015). http://doi.org/10.1115/IMECE2015-50053 Small precision parts with miniaturized features are increasingly used in components such as sensors, micromedical devices, micro-fuel cells, and others. Mechanical micromachining processes, e.g., turning, drilling, milling and grinding are often used […]

No. 9,151,322 | Foil Journal Bearing Application to High Speed Machining Center

No. 9,151,322 | Foil Journal Bearing Application to High Speed Machining Center A foil journal bearing applicable to high speed machining and grinding machines for machining microscopic features. A single foil is secured to and supported by a hollow, generally cylindrical, housing. The foil has a length substantially equal to twice the interior circumference of […]

No. 8,801,290 | Foil Journal Bearing Application to High Speed Machining Center

No. 8,801,290 | Foil Journal Bearing Application to High Speed Machining Center A foil journal bearing applicable to high speed machining and grinding machines for machining microscopic features. A single foil is secured to and supported by a hollow, generally cylindrical, housing. The foil has a length substantially equal to twice the interior circumference of […]

No. 8,602,653 | Foil Thrust Bearing Application to High Speed Machining Center

No. 8,602,653 | Foil Thrust Bearing Application to High Speed Machining Center A foil thrust bearing applicable to high speed machining and grinding machines for machining microscopic features. Top foil segments are circumferentially spaced relative to a rotating runner for engagement by the runner when the bearing is mounted to bearing support runner rotation. Bump […]

Surface Integrity in Ultrahigh Speed Micromachining

S. Jahanmir, “Surface Integrity in Ultrahigh Speed Micromachining,” 1st CIRP Conference on Surface Integrity, Procedia Engineering, Bremen, Germany January 2012. A new ultrahigh speed micro-spindle was used for micro-milling and micro-grinding at speeds greater than 300,000 rpm. Micro-milling was performed on an aluminium alloy with micro-end-mills ranging in diameter from 50 to 300 μm. The dimensional accuracy […]

Ultrahigh Speed Micromachining

S. Jahanmir, “Ultrahigh Speed Micromachining,” ASME Manufacturing Science and Engineering Conference Proceedings, Paper No. MSEC2010-34174, Erie PA, October 2010. A new ultrahigh speed micro-spindle has been developed for micromachining that can be used at rotational speeds as high as 500,000 rpm. Since conventional ball bearings or fluid lubricated journal bearings cannot be used at speeds […]

Design and Evaluation of an Ultrahigh Speed Micro-Machining Spindle

S. Jahanmir, H. Z. Ren, H. Heshmat, and M. Tomaszweski, “Design and Evaluation of an Ultrahigh Speed Micro-Machining Spindle,” Machining Science and Technology, 14 (2010) 224-243. A new ultrahigh speed micro-spindle has been developed for micro-milling that can be used at rotational speeds approaching 500,000 rpm. Since conventional ball bearings or fluid lubricated journal bearings cannot […]

Ultrahigh Speed Micro-Grinding of Dental Ceramics

S. Jahanmir, “Ultrahigh Speed Micro-Grinding of Dental Ceramics,” Machining Science and Technology, 14 (2010) 430-440. Theoretical models and experimental results on machining of industrial ceramics have shown that machining at high speeds reduces the grit depths of cut, thus reducing the contact forces and resulting in a reduced possibility of detrimental chipping and subsurface machining […]

Finite Element Simulation of Straight Plunge Grinding for Advanced Ceramics

T. Chuang, S. Jahanmir, and H. C. Tang, “Finite Element Simulation of Straight Plunge Grinding for Advanced Ceramics” Journal of the European Ceramic Society, 23 (2003) 1723-1733. The objective of this work is to model the grinding forces and the associated stress and deformation fields generated in a ceramic workpiece during plunge surface grinding. A […]

Machining damage Cracks: How to Find and Characterize Them by Fractography

G. D. Quinn, L. K. Ives, and S. Jahanmir, “Machining damage Cracks: How to Find and Characterize Them by Fractography,” Ceramic Eng. and Science Proceeding, 27th International Cocoa Beach Conference on Advanced Ceramics and Composites, 24 (2003) 383-394. Subsurface machining cracks may control strength and performance of finished ceramics. Previously, machining cracks had been though […]

Fractographic Analysis of Machining Cracks in Silicon Nitride Rods and Bars

G. D. Quinn, L K. Ives, S. Jahanmir, and P. Koshy, “Fractographic Analysis of Machining Cracks in Silicon Nitride Rods and Bars,” Fourth International Conference on the Fractography of Glasses and Ceramics IV, Alfred University, July 2000, Ceramic Transactions, American Ceramic Society, Westerville, OH. A new fixture for flexural strength testing was used to evaluate […]

Coolant Flow in Surface Grinding with Non-Porous Wheels

P. Hryniewicz, A. Z. Szeri, and S. Jahanmir, “Coolant Flow in Surface Grinding with Non-Porous Wheels,” International Journal of Mechanical Sciences, 42 (2000) 2347-2367. A parameter that is often used in the assessment of cooling efficiency in grinding is the amount of fluid that flows through the grinding zone. This paper shows that when grinding […]

Simulation of Diamond Ground Surfaces

P. Koshy, L. K. Ives, and S. Jahanmir, “Simulation of Diamond Ground Surfaces,” International Journal of Machine Tools and Manufacture, 39(1999) 1451-1470. State-of-the-art models available for predicting the characteristics of diamond-ground surfaces entail digitization of wheel topography which limits their practical utility. This paper presents a geometric simulation of surface generation in diamond grinding, that […]

Detection of Contact Damage in Ceramics by an Ultrasonic Method

H. S. Ahn, S. Jahanmir, J. A. Slotwinski, and G. V. Blessing, “Detection of Contact Damage in Ceramics by an Ultrasonic Method,” J. Materials Research, 13(1998) 1899-1904. A pulse-echo ultrasonic technique consisting of focused normal-incident compressional waves was used for the detection and evaluation of surface and subsurface damage in micaceous glass-ceramic and silicon nitride […]

Tribology Issues in Machining

S. Jahanmir, “Tribology Issues in Machining,” Machining Science and Technology, 2(1998) 137-154. Machining is the process of shaping materials into useful articles by removing the unwanted material. In traditional machining processes such as in cutting and grinding, the unwanted material is removed by mechanical means using a cutting tool. Since the tool makes contact with […]