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Aiming at the difficulty in achieving the control of micro uniform grinding force and the profiling finishing for the traction wheel groove of elevator utilizing the traditional grinding processes, a constrained abrasive flow finishing method was proposed, and the process characteristics for the abrasive flow were studied by means of theoretical modeling, simulation analysis and finishing experiment. Firstly, the principle of the constrained abrasive flow finishing was analyzed, and a hydrodynamic model of the abrasive flow was constructed based on the Eulerian multiphase flow theory and the standard k-ε double equation model. Then, the fluid dynamics characteristics of the abrasive flow within the constrained flow passage were calculated and studied, yielding the variation patterns of fluid dynamic pressure and abrasive pressure on the workpiece surface with the key process parameters. Finally, a constrained abrasive flow finishing experimental platform was established, and the comparative experiments of finishing were conducted using ductile iron as the workpiece material to verify the simulation calculation and the processing method. The research results indicate that the abrasive pressure and the dynamic pressure reach their maximum values within the constrained space, which is the effective finishing area. Within the range of 15 to 75 degrees, the smaller the inlet angle of the constrained space, the more uniform the distribution of the abrasive pressure, and the more intense the fluid dynamic pressure. As the height of the constrained space decreases, the dimensionless material removal rate increases exponentially, resulting in higher processing efficiency. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of South China Agricultural University is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Modern Medicine & Health is the property of Journal of Modern Medicine & Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ａｉｍｉｎｇ ａｔ ｔｈｅ ｐｒｏｂｌｅｍ ｔｈａｔ ｄｕｒｉｎｇ ｔｈｅ ｂｒａｋｉｎｇ ｐｒｏｃｅｓｓ ｏｆ ｔｈｅ ｅｌｅｖａｔｏｒ ｓａｆｅｔｙ ｇｅａｒ, ｔｈｅ ｂｒａｋｉｎｇ ｐｅｒｆｏｒｍａｎｃｅ ａｆｆｅｃｔｅｄ ｂｙ ｔｈｅ ｔｅｍｐｅｒａｔｕｒｅ ｒｉｓｅ, ｔｈｅ ｍｅａｓｕｒｅｍｅｎｔ ｏｆ ｔｅｍｐｅｒａｔｕｒｅ ｒｉｓｅ ｄｕｒｉｎｇ ｂｒａｋｉｎｇ ｐｒｏｃｅｓｓ ｏｆ ｄｉａｍｏｎｄ ｓｕｒｆａｃｅ ｓａｆｅｔｙ ｇｅａｒ ｗａｓ ｓｔｕｄｉｅｄ. Ｔｈｅ ｍａｔｅｒｉａｌ ｐｒｏｐｅｒｔｉｅｓ ａｎｄ ｔｈｅｒｍａｌ ｐａｒａｍｅｔｅｒｓ ｏｆ ｔｈｅ ｂｌｏｃｋ ｗａｓ ｔｅｓｔｅｄ, ｔｈｅ ｖａｌｕｅｓ ｏｆ ｍｏｄｕｌｕｓ ｏｆ ｅｌａｓｔｉｃｉｔｙ, ｔｈｅｒｍａｌ ｅｘｐａｎｓｉｏｎ ｃｏｅｆｆｉｃｉｅｎｔ, ｔｈｅｒｍａｌ ｃｏｎｄｕｃｔｉｖｉｔｙ ａｎｄ ｓｐｅｃｉｆｉｃ ｈｅａｔ ｃｈａｎｇｅ ｗｉｔｈ ｔｅｍｐｅｒａｔｕｒｅ ｗｅｒｅ ｏｂｔａｉｎｅｄ, ｔｈｅ ｇｒｉｄｓ ｏｆ ｍｏｄｅｌ ｗａｓ ｄｉｖｉｄｅｄ ｂｙ Ｈｙｐｅｍｅｓｈ, ｔｈｅ ｖｅｌｏｃｉｔｙ ａｎｄ ｐｒｅｓｓｕｒｅ ａｍｐｌｉｔｕｄｅ ｃｕｒｖｅｓ ｗｅｒｅ ｄｅｆｉｎｅｄ ｏｎ ｔｈｅ ｂｌｏｃｋ, ｔｈｅ ｆｒｉｃｔｉｏｎ ｇｅｎｅｒａｔｅｓ ｈｅａｔ ｂｅｔｗｅｅｎ ｂｌｏｃｋ ａｎｄ ｇｕｉｄｅ ｒａｉｌ ｗａｓ ｓｉｍｕｌａｔｅｄ ｂｙ Ａｂａｑｕｓ, ｔｈｅ ｍａｘｉｍｕｍ ｓｕｒｆａｃｅ ｔｅｍｐｅｒａｔｕｒｅ ｄｉｓｔｒｉｂｕｔｉｏｎ ｏｆ ｃｌａｍｐ ｂｌｏｃｋ ｕｎｄｅｒ ｄｉｆｆｅｒｅｎｔ ｌｏａｄｓ ａｎｄ ｓｐｅｅｄｓ ｗｅｒｅ ｏｂｔａｉｎｅｄ. Ｔｈｅ ｔｅｓｔ ｏｆ ｍｅａｓｕｒｅｍｅｎｔ ｏｆ ｂｒａｋｉｎｇ ｔｅｍｐｅｒａｔｕｒｅ ｒｉｓｅ ｗａｓ ｃａｒｒｉｅｄ ｏｕｔ ｂｙ ｔｅｓｔ ｔｏｗｅｒ, ｔｈｅｒｍｏｃｏｕｐｌｅ ａｎｄ ｔｅｍｐｅｒａｔｕｒｅ ｒｅｃｏｒｄｅｒ, ｔｈｅ ｔｅｍｐｅｒａｔｕｒｅ ｃｈａｎｇｅｓ ｕｎｄｅｒ ｄｉｆｆｅｒｅｎｔ ｌｏａｄｓ ａｎｄ ｓｐｅｅｄｓ ｗｅｒｅ ｏｂｔａｉｎｅｄ, ｔｈｅ ｓｉｍｕｌａｔｉｏｎ ｒｅｓｕｌｔｓ ａｎｄ ｔｅｓｔ ｒｅｓｕｌｔｓ ｗｅｒｅ ａｌｓｏ ａｎａｌｙｚｅｄ. Ｔｈｅ ｒｅｓｕｌｔｓ ｉｎｄｉｃａｔｅ ｔｈａｔ ｔｈｅ ｒａｔｅｄ ｓｐｅｅｄ ｂｅｌｏｗ ２. ５ ｍ/ ｓ,ｔｈｅ Ｊ ｔｈｅｒｍｏｃｏｕｐｌｅ ｉｓ ｕｓｅｄ ａｎｄ ｔｈｅ ｍａｘｉｍｕｍ ｔｅｍｐｅｒａｔｕｒｅ ｍｅａｓｕｒｅｄ ｉｓ ｔｈｅ ｓａｍｅ ａｓ ｔｈｅ ｓｉｍｕｌａｔｉｏｎ ｒｅｓｕｌｔ. [ABSTRACT FROM AUTHOR]