The Experts below are selected from a list of 801 Experts worldwide ranked by ideXlab platform

Hong Zhongyan - One of the best experts on this subject based on the ideXlab platform.

  • The fabrication of Eccentric stepped-Shaft forgings using the process of cross-wedge rolling
    Journal of Materials Processing Technology, 1992
    Co-Authors: Ren Guangsheng, Bai Zhibin, Zhang Chengjian, Hong Zhongyan
    Abstract:

    Abstract The technology of fabrication of Eccentric stepped-Shaft forgings using the process of cross-wedge rolling is proposed in this paper. The geometrical characteristics of the directrix of the working surface on cross-wedge dies to form the Eccentric step are analysed and simple directrix equations capable of being used easily in engineering are presented. The maximum Eccentric dimension that can be formed with the process is derived on the basis of the rotation conditions of the Eccentric deformation. The effects of positional error of the dies on the dimensional and geometrical precision of the Eccentric step are investigated. The technology has been used to produce three kinds of Eccentric Shaft in batch quantities and very good technical and economic benefit has resulted.

Ren Guangsheng - One of the best experts on this subject based on the ideXlab platform.

  • The fabrication of Eccentric stepped-Shaft forgings using the process of cross-wedge rolling
    Journal of Materials Processing Technology, 1992
    Co-Authors: Ren Guangsheng, Bai Zhibin, Zhang Chengjian, Hong Zhongyan
    Abstract:

    Abstract The technology of fabrication of Eccentric stepped-Shaft forgings using the process of cross-wedge rolling is proposed in this paper. The geometrical characteristics of the directrix of the working surface on cross-wedge dies to form the Eccentric step are analysed and simple directrix equations capable of being used easily in engineering are presented. The maximum Eccentric dimension that can be formed with the process is derived on the basis of the rotation conditions of the Eccentric deformation. The effects of positional error of the dies on the dimensional and geometrical precision of the Eccentric step are investigated. The technology has been used to produce three kinds of Eccentric Shaft in batch quantities and very good technical and economic benefit has resulted.

Masařík Adam - One of the best experts on this subject based on the ideXlab platform.

  • Modifying of the Eccentric Shaft and gear for vertical forging press
    Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017
    Co-Authors: Masařík Adam
    Abstract:

    This diploma thesis deals with the design and realization of a detachable joint for transferring a large torque from a drive to a driven member in a vertical forging press. The first part analyzes the disadvantages of production, assembly and disassembly of the original wedge joint of Eccentric Shaft and gear. The design of a new detachable joint is intended to remove the disadvantages of the original joint. Verification calculations are part of the proposal. The next part deals with the production of joint elements and the modification of the connected components for the designed joint

  • Modifying of the Eccentric Shaft and gear for vertical forging press
    Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017
    Co-Authors: Masařík Adam
    Abstract:

    Tato diplomová práce se zabývá návrhem a realizací rozebíratelného spoje, který slouží pro přenos velkého krouticího momentu z hnacího na hnaný člen ve svislém kovacím lisu. V první části jsou analyzovány nevýhody výroby, montáže a demontáže původního klínového spojení výstředníkové hřídele a ozubeného kola. Návrh nového rozebíratelného spojení má odstraňovat nevýhody původního spojení. Součástí návrhu jsou kontrolní výpočty. Další část se zabývá výrobou spojovacích elementů a úpravou spojovaných součástí pro navrhnutý spoj.This diploma thesis deals with the design and realization of a detachable joint for transferring a large torque from a drive to a driven member in a vertical forging press. The first part analyzes the disadvantages of production, assembly and disassembly of the original wedge joint of Eccentric Shaft and gear. The design of a new detachable joint is intended to remove the disadvantages of the original joint. Verification calculations are part of the proposal. The next part deals with the production of joint elements and the modification of the connected components for the designed joint.

Chao Zhai - One of the best experts on this subject based on the ideXlab platform.

  • A micro-optical fiber positioner
    Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 2018
    Co-Authors: Jian-ping Wang, Zhigang Liu, Chao Zhai, Zengqiang Zhou, Jiaru Chu
    Abstract:

    This paper gives a scheme of optical fiber positioner structure of a miniature, by use of the DC servo motor with the diameter of 3mm driver, the distance can designed to 8.5mm, and can arrange more than 12000 fibers in the focal plane with the diameter of 1 meters, it is especially suitable for telescope with small dimension focal plane and has high density fiber positioning requirements. Based on the principle of double rotary fiber positioning principle, It consists of a hollow Shaft revolving mechanism, and Eccentric axis revolving mechanism relative to hollow Shaft. The hollow Shaft turns round at the range of -180 degrees to +180 degrees and the Eccentric axis turns round at the range of -90 degrees to +90 degrees at the half of radius driving by each control motor. When positioning, the optical fiber end moves on the focal plate throughout, and can never deviate from focal plane. optical fiber is fixed in the mounting hole of fiber support which installed on the Eccentric rotary Shaft (fiber support’s hole axis is parallel to the axis of the hollow Shaft), and fiber will lead to pass through the inner hole of the hollow Shaft and focal plate then connected to the spectrometer. positioner center Shaft adopts planetary gear driving principle, with small module motor’s gear and the fixed ring gear can driving motor and positioner planetary rotate, the Eccentric Shaft by DC servo motor with the diameter of 3mm drived coaxial optical fiber on the Eccentric Shaft, the center and the Eccentric Shafts adopts micro rolling bearing support; in order to prevent the positioner’s center and Eccentric Shaft to rotate out of bounds, both limiting devices have designed to ensure the safety of fiber positioning; both center and Eccentric Shaft are designed with a spring structure to eliminate the influence of gear clearance; because positioner size is very small, the positioner driving wire is embedded in the slot of the hollow Shaft sleeve wall. This will not affect the fiber go through the center Shaft’s holes and pass through the focal plane; positioner sample test results show that the closed-loop positioning can reached accuracy of 0.01mm unit, and can meet with the demand of optical fiber positioning.

  • Structural error simulation analysis of LAMOST fiber units
    Ground-based and Airborne Instrumentation for Astronomy VII, 2018
    Co-Authors: Xinyu Feng, Yuran Shen, Chao Zhai
    Abstract:

    LAMOST requires fast and accurate alignment of 4000 optical fiber units on a 1.75m-diameter convex focal plane to simultaneously observe 4000 targets, and the positioning accuracy of the unit is very demanding. But in fact there are a variety of factors such as motor motion error, machining error, assembly error, etc. which may lead to great positioning error. Moreover gear meshing transmission at the Eccentric Shaft and the anti-backlash spring may also cause greater positioning accuracy error. Besides,the inevitable gap between the center Shaft and the bearing leads to motion error of the rotation mechanism, which also affects the precise positioning of the optical fiber. Therefore, in this paper, model and simulate the Eccentric Shaft basing on virtual prototype ADAMS set parameters and change the axial restraint of the gear, then obtain the axial movement curve. Design 9 groups of comparative tests through orthogonal experimental design.The results in case that: (1) The maximal movement of the gear at the Eccentric Shaft is within the allowable range, and has little effect on the unit positioning accuracy; (2) The overall error of the unit Shaft clearance is in the range of -0.06deg/s -0.2deg/s, which leads to low positioning accuracy that may not meet the observation requirement. This research provides a theoretical basis for the design of a new generation high-precision positioning unit in the future.

  • A compact optical fiber positioner
    Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 2016
    Co-Authors: Jian-ping Wang, Zhigang Liu, Zengxiang Zhou, Chao Zhai, Jiaru Chu
    Abstract:

    In this paper, a compact optical fiber positioner is proposed, which is especially suitable for small scale and high density optical fiber positioning. Based on the positioning principle of double rotation, positioner’s center Shaft depends on planetary gear drive principle, meshing with the fixed annular gear central motor gear driving device to rotate, and the Eccentric Shaft rotated driving by a coaxial Eccentric motor, both center and the Eccentric Shaft are supported by a rolling bearings; center and Eccentric Shaft are both designed with electrical zero as a reference point, and both of them have position-limiting capability to ensure the safety of fiber positioning; both Eccentric and center Shaft are designed to eliminating clearance with spring structure, and can eliminate the influence of gear gap; both Eccentric and center motor and their driving circuit can be installed in the positioner’s body, and a favorable heat sink have designed, the heat bring by positioning operation can be effectively transmit to design a focal plane unit through the aluminum component, on sleeve cooling spiral airway have designed, when positioning, the cooling air flow is inlet into install hole on the focal plate, the cooling air flow can effectively take away the positioning’s heat, to eliminate the impact of the focus seeing. By measuring position device’s sample results show that: the unit accuracy reached 0.01mm, can meet the needs of fiber positioning.

  • New type optical fiber positioning unit device for LAMOST
    Large Ground-based Telescopes, 2003
    Co-Authors: Xiaozheng Xing, Chao Zhai
    Abstract:

    This paper proposes an optical fiber positioning unit device for LAMOST(Large Area Multi-Object Fiber Spectroscope Telescope), It consists of a central Shaft revolving mechanism, and Eccentric Shaft revolving mechanism relative to central Shaft. The central Shaft turns round at the range of -180° to +180° and the Eccentric Shaft turns round at the range of -90° to +90° driving by each control motor. When positioning, the optical fiber end moves on the focal plate throughout, and can never deviate from focal plane. It has simple structure, could be machined and assembled and taken down easily and could be ensured machining practices easily, so could be reduced manufacture costs. The unit sets mechanical electrical zero position detecting device to reduce the accumulate error of multi-positioning. Testing result have demonstrated this new double revolving optical fiber positioning unit device can accord with the demand of LAMOST entirely.

Jiang Wu - One of the best experts on this subject based on the ideXlab platform.

  • Research of the radial piston pump Shaft dynamic balance and structure improvement
    2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA), 2016
    Co-Authors: Sanwu Wang, Wenkai Ou, Jiang Wu
    Abstract:

    The dissertation has researched the structure of Eccentric Shaft from the power end of the radial reciprocating piston pump, and has analyzed the unbalanced inertia force generated in the process of high-speed rotary motion. It has pointed out the requirement of dynamic balance design of the Eccentric Shaft, and has completed the dynamic balance design of the Eccentric Shaft. The ADAMS was used to do the dynamics simulation of the Eccentric Shaft, thus the size of Eccentric weight plate was obtained. The improved structure can make the Eccentric Shaft suffer the minimal inertial force in its working process. The results are verified by experiments.