Deformation characteristic of thread and spline synchronous rolling process

2016 ◽  
Vol 87 (1-4) ◽  
pp. 835-851 ◽  
Author(s):  
Da-Wei Zhang ◽  
Sheng-Dun Zhao
Keyword(s):  
Deformation Characteristic ◽  
Rolling Process ◽  
Synchronous Rolling

In Situ Plate Load Tests on the Soilbag Reinforced Expansive Soil Foundation

2013 ◽  
Vol 718-720 ◽  
pp. 1888-1894
Author(s):  
F.Q. Bai ◽  
Si Hong Liu ◽  
Jian Qiang Xu ◽  
Xue Jiang Liu ◽  
Li Hong Gao
Keyword(s):  
Deformation Characteristic ◽  
Expansive Soil ◽  
Rolling Process ◽  
Compressive Property ◽  
Load Range ◽  
North Water ◽  
Load Tests ◽  
Soil Foundation ◽  
Unloading Stiffness

In this paper, the research background of soilbag technique applied in the middle route of the South-to-North Water Transfer Project (SNWTP) is first described along with the reinforcement principle of soilbags. The loading deformation characteristics of the foundations for the marl, large-soilbag and small-soilbag are then discussed according to the in-situ load tests. The testing results indicate that the soilbag can improve the compression deformation characteristic of marl foundation significantly. The loading stiffness values of the marl, large-soilbag and small-soilbag foundations are about 16 to 18, 20 to 40 and 30 to 90 MPa/m respectively. Within the load range from 0 to 450 kPa, the loading and unloading p-s curves of soilbags consist of two parts, namely the perfectly elastic zone and the elasto-plastic zone. The unloading stiffness of soilbags is nearly 2 to 10 times greater than the loading stiffness. In addition, the mechanical rolling process can, to some extent, improve the compressive property of the soilbag foundation.

scholarly journals Influence of Processing Parameters on the Thread and Spline Synchronous Rolling Process: An Experimental Study

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1716
Author(s):  
Da-Wei Zhang ◽  
Bing-Kun Liu ◽  
Sheng-Dun Zhao
Keyword(s):  
Rotational Speed ◽  
Rolling Process ◽  
Processing Parameters ◽  
Geometric Parameters ◽  
Orthogonal Experimental Design ◽  
Processing Parameter ◽  
Forming Process ◽  
Experimental Conditions ◽  
Synchronous Rolling ◽  
Motion Parameters

The thread and spline synchronous rolling (TSSR) process is a new developed rolling process, which can form the different profiles simultaneously in the process and can ensure the consistency of the relative position of different profiles of parts. However, the multi-meshing motions are intercoupling and the multi-deformation characteristics are intercoupling during the forming process. It can easily result in dimension overshoot, and even does not make the synchronous rolling process go smoothly. Exploring the influence of controllable processing parameters on the synchronous rolling process, especially the geometric parameters of rolled parts, is helpful to determine the parameters and control the size error for a smooth rolling process. Thus, in this paper, the effects of controllable geometric parameters and motion parameters such as billet diameter, radial feed-in speed, and rotational speed of synchronous rolling die on the TSSR process have been studied. The synchronous rolling experimental scheme was determined using an orthogonal experimental design method, and the geometric parameters of different tooth profiles of rolled parts were measured and analyzed. The experimental results indicated that: the uncoordinated meshing movement between different tooth profiles is more likely to cause tooth error of the splined section of the part; variations of the processing parameters are more likely to cause fluctuations in the size of the splined section of the part, and change of the billet diameter mainly affects the outside diameter of the threaded and splined sections, and the threaded and splined pitches are mainly affected by the motion parameters of the synchronous rolling die; the motion parameters of the rolling die should be matched and the lower rotational speed needs to match the lower radial feed-in amount per revolution; the ideal dimensional accuracy can be obtained by using an appropriate processing parameter combination, for example, the pitch error of the splined section of the part is less than 0.5 μm under one set of experimental conditions in this paper.

Phase characteristic between dies before rolling for thread and spline synchronous rolling process

2015 ◽  
Vol 81 (1-4) ◽  
pp. 513-528 ◽  
Author(s):  
Da-Wei Zhang ◽  
Sheng-Dun Zhao ◽  
Shi-Bo Wu ◽  
Qi Zhang ◽  
Shu-Qin Fan ◽  
...  
Keyword(s):  
Rolling Process ◽  
Phase Characteristic ◽  
Synchronous Rolling

The Condition for Absolute Stability of an Electroelastic Actuator Control System for Nanomechatronics

2020 ◽  
Vol 10 (10) ◽  
pp. 52-58
Author(s):  
Sergey M. AFONIN ◽  
Keyword(s):  
Control System ◽  
Adaptive Optics ◽  
Absolute Stability ◽  
Deformation Characteristic ◽  
Straight Line Segment ◽  
Control Mechanisms ◽  
Relative Width ◽  
Random Inputs ◽  
Deformation Control ◽  
Actuator Control

An electroelastic actuator for nanomechatronics is used in nanotechnology, adaptive optics, microsurgery, microelectronics, and biomedicine to actuate or control mechanisms, systems based on the electroelastic effect, and to convert electrical signals into mechanical displacements and forces. In nanomechatronic systems, a piezoactuator is used in scanning microscopy, laser systems, in astronomy for precision alignment, for compensation of temperature, gravitational deformations and atmospheric turbulence, focusing, and stabilizing the image. In this study, a condition for absolute stability of an electroelastic actuator control system for nanomechatronics under deterministic and random inputs is obtained. A number of equilibrium positions in an electroelastic actuator mechatronic control system are found, the totality of which is represented by a straight line segment. The electroelastic actuator’s deformation control system dead band relative width is determined for the actuator’s symmetric and asymmetric hysteresis characteristics. Under deterministic inputs and with fulfilling the condition for the derivative of the nonlinear hysteresis actuator deformation characteristic, the set of equilibrium positions of the electroelastic actuator control system for nanomechatronics is absolutely stable. Under random inputs, the system absolute stability with respect to the mathematical expectations of the electroelastic actuator mechatronic control system equilibrium positions has been determined subject to fulfilling the condition on the derivative of the actuator hysteresis characteristic.

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