Study of a burr size calculation model for the hot sawing and shearing process
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ORIGINAL ARTICLE
Study of a burr size calculation model for the hot sawing and shearing process Chen Wang1 · Yuanhua Shuang1 · Wenhao Wang1 · Yutian Zhang1 · Chao Li1 · Yan Zhou1 Received: 11 February 2020 / Accepted: 23 July 2020 / Published online: 14 August 2020 © Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Based on burr fracture morphology and burr geometry, it is concluded that the main cause of burr formation is the overall metal slip caused by the feed force of sawing and shearing. Based on the assumption that the feed force is uniformly distributed along the incision plane, the burr thickness calculation model for sawing and shearing is formed by coupling the sawing and shear force model and the blanking force model. For preheating temperatures of 500∼900◦ C, feeding speeds of 30∼90 mm/s, and saw tangent speeds of 3000∼9000 mm/s, 30 mm × 30 mm GCr15 square steel was used for experiments. Through the calculation model given in this paper, the rule for the influence of the process parameters on burr thickness was obtained. Finally, a sawing and shearing experiment was carried out, and the results show that the maximum relative error between the experimental data and the calculated results is 15%, which verifies the reliability of the calculation model. Keywords Hot sawing and shearing · The formation mechanism of burrs · The calculation of burr size · Overall metal sliding · Hot sawing and shearing experiment
1 Introduction A hot sawing machine is usually installed behind the mill in a production line. The production of the whole rolling workshop is often affected by the limited capacity of the hot sawing machine. For the hot sawing machine, the feed force of the blade and the support force of the base create shear coupling, which produces a shear effect. The sawing and shearing force produces sawing and shearing effects. These two effects exist at the same time, so we generally call them hot sawing and shearing processes. In the field of steel processing, process parameters affect the processing quality, and burr is an important index of processing quality. Studying burrs is crucial. Pramanik et al. [1] studied the influence of different process parameters on burr when drilling 350-grade low-carbon steel, and the results showed that the interactions among different machining parameters significantly affected burr formation. Kumar et al. [2] conducted an experimental study of surface Yuanhua Shuang
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Heavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan University of Science and Technology, Taiyuan, 030024, China
burr formation in Ti6Al4V alloy high-speed micromilling, and the effects of different cutting parameters and tool parameters on top burr formation were analysed to establish correlations among them. Liu et al. [3] investigated the features and mechanisms of exit burr formation as well as the influence of grinding conditions, including grinding speed, grinding depth, wheel granularity, and grinding pass sequences, on the ex
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