Investigation of a new-type precision cropping system with variable-frequency vibration

Hua, Chunrong; Zhao, Shengdun; Zhang, Lin Jie; Liu, W.

doi:10.1016/j.ijmecsci.2006.08.010

Cited by 23 publications

(12 citation statements)

References 1 publication

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“…The cropping time for every segment of 45 steel bar and every segment of 20 steel bar is respectively about 18s and 15s, which is also obviously less than the cropping time in [12]. According to the quality assessment parameters of cropping cross-section in [12], the maximum widths of the fault region (arrow area) in Fig.…”

Section: The Experimental Results Of the Crop-ping Machinementioning

confidence: 99%

“…According to the quality assessment parameters of cropping cross-section in [12], the maximum widths of the fault region (arrow area) in Fig. (6 and 7) are respectively 0.96mm and 0.18mm, which is less than 1mm and 0.2mm in [12] under the same working conditions. The fatigue crack expands along the upper and lower direction of the bar cross-section of the V-shaped groove tip, which is mainly related with the force F y in the Y direction acted on the bar, but the force F x in the X direction acted on the bar is less than F y .…”

Section: The Experimental Results Of the Crop-ping Machinementioning

confidence: 99%

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Analysis of Modeling and Vibration Performance of a New Type of Cropping Machine

Zhang¹,

Zhao²

2014

TOMEJ

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Abstract:In order to reduce the cropping force and enhance the cropping cross-section quality, a new type of cropping machine is proposed in this paper. The basic structure and working principle of the cropping machine are introduced. Based on D'Alembert's principle, the vibration equations of the cropping machine along the Y direction, the X direction and around X, Y, Z axes are built in detail and the motion curves of the vibration body in all directions are also obtained. The amplitude frequency response characteristic curve of the vibration body in the Y direction is given and the resonance frequency of the vibration body in the Y direction is about 7.94 rad/s. The cropping experimental results show that the cropping force acted on the metal bar is low and the cross-section quality is very high.

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Section: The Experimental Results Of the Crop-ping Machinementioning

confidence: 99%

Section: The Experimental Results Of the Crop-ping Machinementioning

confidence: 99%

Analysis of Modeling and Vibration Performance of a New Type of Cropping Machine

Zhang¹,

Zhao²

2014

TOMEJ

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“…For example, metal chains, bearings, and various bearing parts, as long as the shaft-related parts are processed using metal bar material cropping. 1,2 The quality cross section directly affects the machining quality and production efficiency of the subsequent parts. The traditional cropping processes (sawing, 3 shearing 4 ) have many disadvantages such as serious waste of bar material, low cropping efficiency, serious pollution of sawing, 5 and the low section size accuracy of shearing 6 require extra machining and increase the processing cost and so on.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study on optimal cropping load control strategy of duralumin alloy AlCu4Mg1 based on linear elastic fracture mechanics

Zhong

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, a metal bar fine-cropping system is designed to study the influence load control strategies based on theoretical and cropping experiments. The principle of the new cropping system and mechanical compositions system are introduced. Three different load control strategies are designed based on duralumin alloy AlCu4Mg1 bar, and the optimal loading order is determined under them. According to a new proposed cross-section quality evaluation method, the test results show constant stress intensity factor range of external load ([Formula: see text]), linear decreasing cyclic load of appropriate time coefficient ([Formula: see text]) can obtain better cropping effect and the best quality is obtained by the loading cycle ([Formula: see text]).

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“…Hua et al (Hua et al, 2004) (Zhang et al, 2007) studied the influence of the geometric parameters of V-shaped notch on the crack initiation in precision cropping, and the reasonable values of the geometric parameters of V-shaped notch were determined. Zhao et al (Hua et al, 2006) (Zhao et al, 2007) proposed a low-stress cropping method with the variable-frequency vibration based on fatigue fracture mechanism and studied the method for heat stress prefabricating ideal crack at the bottom of V-shaped notch. Tang et al (Tang et al, 2010) proposed a new-type precision cropping system with controllable multiple pneumatic cylinders and radial impact, as well as built the calculating formula of the maximum load and the initial frequency.…”

Section: Introductionmentioning

confidence: 99%

Research on hydraulic compensation and variable loading arm for a new-type low-stress cropping system

Wang

Zhang

et al. 2018

JAMDSM

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Aiming at that the instability of the loading force in the low-stress cropping causes the poor quality of the bar cross-section, a precision cropping system with hydraulic compensation and variable loading arm is proposed. The working principle of the cropping method is introduced. The stability of the loading force acting on the bar during the blanking process is analyzed, a method for evaluating the stability of the loading force is proposed and on this basis the fixed speed of the main shaft is determined to be 1000r/min. The research results show that the stability of the loading force is improved by applying the reasonable hydraulic compensation force. With the help of stress concentration coefficient and stress intensity factor, the required critical loading force before and after the crack initiation at the V-shaped notch tip is obtained and it is determined that the best loading arm after crack initiation is 24.7mm. Based on it, the abrupt change problem of the critical loading force before and after the crack initiation is further solved. The experimental results also show that the high quality cross-section can be obtained by the proposed cropping method.

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Investigation of a new-type precision cropping system with variable-frequency vibration

Cited by 23 publications

References 1 publication

Analysis of Modeling and Vibration Performance of a New Type of Cropping Machine

Analysis of Modeling and Vibration Performance of a New Type of Cropping Machine

Theoretical and experimental study on optimal cropping load control strategy of duralumin alloy AlCu4Mg1 based on linear elastic fracture mechanics

Research on hydraulic compensation and variable loading arm for a new-type low-stress cropping system

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