Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province

Hangzhou, China

Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province

Hangzhou, China
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Zhang H.,Zhejiang University | Peng T.,Zhejiang University | Peng T.,Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province | Xu S.,Zhejiang University
Procedia CIRP | Year: 2017

Many parameters in a laser based powder bed fusion process affect the part property. In this research, experiments were designed to study how scanning pattern affects the properties of printed 17-4 PH stainless steel parts. Five different representative scanning patterns were adopted. Micro hardness, density and energy consumption values of the sample parts were analyzed. Micro hardness was evenly distributed, and above the standard hardness value. Hardness in cross section is generally higher than that in vertical section. Density of parts in concentric line pattern is the lowest, and continuous mesh is the highest. Using continuous mesh, it consumed more energy than others. © 2017 The Authors.


Deng X.,Quzhou University | Deng X.,Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province | Fu J.,Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province | Chen Z.,Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province
International Journal of Materials and Structural Integrity | Year: 2015

In this paper, the thermal-structural coupling field analysis model of spindle system is established, and the numerical simulation which accounts for the spindle component system's structure, the actual working condition, the influence of heat source and lubrication system condition factors, etc. which are from a machine tool factory, such as ambient temperature, flow velocity of coolant, and the rotating speed of spindle motor, etc., is conducted. It is found that the maximum temperature up to about 38.8°C appears in the spindle where the double row cylinder roller bearing is installed, while the maximum comprehensive deformation of the spindle's front-end reaches 0.93 × 10-5 m. And the spindle system needs nearly 1 hour to reach thermal equilibrium state when the system uses the L-HM32 lubricant. However, temperature rise, heat deformation and the thermal equilibrium time are reduced by 11.1%, 22.6% and 12%, respectively, when the lubricant of the lubrication system is replaced by Shell-tellus22, and the maximum Von-Mises stress value is 125.6 MPa. The results are beneficial for providing a basis for the requirements of practical manufacture, especially the optimisation of structure, cooling system and compensation system design. Copyright © 2014 Inderscience Enterprises Ltd.

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