Bottom Dead Center Repeat Precision of High-Speed Press Measurement

2012 ◽  
Vol 249-250 ◽  
pp. 31-35 ◽  
Author(s):  
Xiang Zheng ◽  
Jun Ling Wang ◽  
Jing Lin Yao
Keyword(s):  
High Speed ◽  
Production Level ◽  
Technical Level ◽  
Evaluation Standard ◽  
Testing Apparatus ◽  
Bottom Dead Center ◽  
Important Index ◽  
The Press ◽  
Practical Guidance ◽  
Test Result

Bottom dead center repeat precision is the key evaluation standard of high-speed press, it’s an important index to judge production level and technical level. Use model RM-7201 testing apparatus to measure bottom dead center of high-speed press at different conditions, find out laws according to the test result. These findings may helpful in proving correctness of bottom dead center precision analysis and to control the B.D.C precision of the high-speed press. Provide practical guidance basis to improve the press structure and bottom dead center precision.

Influence of Crank Radius on the Curve Shapes for a Multi-Link High-Speed Precision Press

2011 ◽  
Vol 141 ◽  
pp. 313-318 ◽  
Author(s):  
Xin Jian Lu ◽  
Si Hong Zhu ◽  
Zun Mang Ke ◽  
Jian Qin ◽  
Shao Wei
Keyword(s):  
Simulation Model ◽  
Dynamic Simulation ◽  
High Speed ◽  
Lateral Force ◽  
Inertial Forces ◽  
Software Environment ◽  
Bottom Dead Center ◽  
The Press ◽  
Adams Software ◽  
Dynamic Simulation Model

The parameterized dynamic simulation model for a multi-link high precision press has been established in the ADAMS software environment based on the displacement equations. The press being developed is taken as an example to study the slider’s displacement curves, velocity curves and acceleration curves under different crank radius in practice as well as the working angle curves and torque curves. With the crank radius increasing, the started punching angle comes early and the slider’s velocity and acceleration at bottom dead center (B.D.C) decreases significantly which help to improve the accuracy of B.D.C and to lower the torque consumption during stamping. Meanwhile, the increasing of working angle helps to reduce the lateral force acting on the slider, such as the torque required to overcome the inertial forces increases rapidly, the torque needed to overcome the nominal force decreases and the peak of nominal force shifts to the lower left gradually. Results of the research mentioned above are helpful to develop the multi-link high-speed press.

scholarly journals The Utilisation of Shredded PET as Aggregate Replacement for Interlocking Concrete Block

2018 ◽  
Vol 34 ◽  
pp. 01006
Author(s):  
M. Mokhtar ◽  
M. Kaamin ◽  
S. Sahat ◽  
N.B. Hamid
Keyword(s):  
Compressive Strength ◽  
High Speed ◽  
Concrete Block ◽  
Strength Test ◽  
Environmental Threat ◽  
Compressive Strength Test ◽  
The World ◽  
Recycled Plastics ◽  
Block Concrete ◽  
Test Result

The consumption of plastic has grown substantially all over the world in recent years and this has created huge quantities of plastic-based waste. Plastic waste is now a serious environmental threat to the modern way of living, although steps were taken to reduce its consumption. This creates substantial garbage every day, which is much unhealthy. Plastic bottles such as Polyethylene terephthalate (PET) was use as the partially component in this making of interlocking blocks concrete. This project investigates the strength and workability of the interlocking block concrete by replacing course aggregate with % PET. The suitability of recycled plastics (PET) as course aggregate in interlocking block concrete and its advantages are discussed here. Moreover, there were more benefits when using interlocking block than using conventional block such as it easy for construction because they are aligning, easy to place, high speed stacking and they offer more resistance to shear and buildings would be even stronger. Based on the test perform, the failure parameter were discussed .From the compressive strength test result, it shows that the strength of concrete block decreased with increased of PET used. From the results, it shows that higher compressive strength was found with 5% natural course aggregate replaced with PET compared to other percentages.

Structure Optimization Design of Drum of High-Speed Tire Test-Bed

2011 ◽  
Vol 291-294 ◽  
pp. 2306-2310
Author(s):  
Shi Wu Li ◽  
Jing Jing Tian ◽  
Zhi Fa Yang ◽  
Hai Zheng Wang ◽  
Lu Chen
Keyword(s):  
Natural Frequency ◽  
High Speed ◽  
Optimization Design ◽  
Operating Mode ◽  
Total Weight ◽  
Topological Optimization ◽  
Test Bed ◽  
Optimization Analysis ◽  
Element Density ◽  
Test Result

In order to study the effect of tire operating mode on its safety performance, a high-speed tire test-bed was put forward. The dynamic characteristic of drum was important for test result. To avoid the resonance of loaded drum during operation, the topological optimization analysis of drum with I-shaped structure was fulfilled with the element density as variables and the volume reduction of fifty percent as constraint condition and the first natural frequency as objective function. The optimal density distribution of drum was obtained within the constraint of the first natural frequency. Based on the analysis result of topology optimization, the drum structure with I–shaped was modified. The structure size of the new and improved drum was optimized with 50 iterative calculations using ANSYS. On the condition that the first natural frequency of drum was over 60Hz, the structure size of drum was optimal when the rate of the first natural frequency and total weight was highest and equaled to 0.05391. The optimization results showed the first natural frequency of drum was raised by 21.972Hz and its total weight was reduced by 69.95Kg.

Tangential Follow System of High-Speed Leather Cutting Machine Modeling and Control Optimization

2011 ◽  
Vol 317-319 ◽  
pp. 649-654
Author(s):  
Yan Wei Zhao ◽  
Meng Sheng ◽  
Ting Li ◽  
Xin Min Wu ◽  
Shuo Jiang
Keyword(s):  
High Speed ◽  
Fitness Function ◽  
Numerical Control ◽  
Mechanical Transmission ◽  
Combined System ◽  
Evaluation Standard ◽  
Modeling And Control ◽  
Cutting Machine ◽  
Machine Modeling ◽  
Performance Indexes

As to the low dynamic response of tangential follow system, especially the poor dynamic follow ability when executing small arc rapid interpolation. Based on the principle of mechanical dynamics, the mathematical model of leather cutting machine tangential follow mechanical transmission system is built, considering a type of high-speed numerical control leather cutting machine as the research object. Joined mechanical model and servo motor model together, its electromechanical combined system diagram is created by Simulink. On the basis of this diagram, the dynamic characteristic is analyzed. The composite evaluation standard including multiple performance indexes is used for the fitness function, the three-ring PID control parameters of tangential follow system is optimized with genetic algorithm (GA). The results show that GA optimization is more superior and efficient, comparing with traditional PID setting method.

scholarly journals Uniform Distribution and Densification of Jets in Needleless Electrospinning Using Annular Tip Nozzle

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1301 ◽  
Author(s):  
Hongbo Chen ◽  
Chuansheng Wang ◽  
Imdad Ali ◽  
Haoyi Li ◽  
Xiaoqing Chen ◽  
...  
Keyword(s):  
Free Surface ◽  
High Speed ◽  
Repulsive Force ◽  
Closed Curve ◽  
Environmental Friendliness ◽  
Ultrafine Fibers ◽  
Needleless Electrospinning ◽  
Straight Line ◽  
Distribution Process ◽  
Practical Guidance

Numerous jets can be generated simultaneously on a nozzle by needleless melt electrospinning technology which has the advantages of solvent-free residues and environmental friendliness; and potential industrial application prospects. In this paper, the linear annular tip nozzle was taken as the research object, and the high-speed image acquisition of the jets generation and distribution process of annular tip nozzle was carried out and compared with that of straight-line tip nozzle. The results showed that the repulsive force between the jets caused a slight adjustment in the position of the jets on the free surface, the force between the jets on the annular closed curve canceled each other and eventually reached the equilibrium state, making the position of the jets stable and the distance between the jets the same, and the distance between the jets was related to the intensity of the induced electric field at the tip of the nozzle. Relevant conclusions can provide scientific and practical guidance for the design of needleless electrospinning nozzles on free surface in order to achieve uniform and efficient preparation of ultrafine fibers.

Optimization of Motion Control in High-Speed Servo Press Line

2010 ◽  
Vol 4 (5) ◽  
pp. 439-446 ◽  
Author(s):  
Hideki Taoka ◽  
◽  
Hiroyuki Nobuta ◽  
Hideo Meguri ◽  
Yoshihiro Kageyama
Keyword(s):  
Motion Control ◽  
Production System ◽  
High Speed ◽  
Global Scale ◽  
Automotive Body ◽  
Press Forming ◽  
Servo Press ◽  
The Press

Honda Engineering Co., Ltd. developed an innovative servo press line that achieves the world’s highest level of productivity in producing deep-drawn automotive body panels. The innovative press production system was made so that the press forming conditions and panel transfer motions are adjusted to the dies very accurately for each part to be produced. The servo press line is planned to be expanded to Honda’s production plants on a global scale while allowing further evolution.

Dynamic precision analysis and experimental verification of high-speed precision punch press

2016 ◽  
Vol 230 (20) ◽  
pp. 3655-3662 ◽  
Author(s):  
Fengfeng Hu ◽  
Yu Sun ◽  
Binbin Peng
Keyword(s):  
Elastic Wave ◽  
Dynamic Model ◽  
High Speed ◽  
Impact Factors ◽  
Superposition Method ◽  
Bottom Dead Center ◽  
Dynamic Precision ◽  
Modal Superposition Method ◽  
The Impact ◽  
Punch Press

In order to investigate the impact factors and their affection on high-speed precision multilink punch press (MPP), the dynamic model with different joint clearance was established, and the influence of different clearance and speed on the dynamic positional repeatability of bottom dead center (BDC) was analyzed. The elastic dynamic model of high-speed MPP was established, the affection of the elastic deformation and elastic wave on the positional repeatability of the BDC were presented by using modal superposition method to solve dynamic equation. Meanwhile, experiments on the dynamic repeatability of the BDC of the punch during working were completed. At last, the comparison of the experimental results with the analyzed results was given, and based on which, it can be concluded that the clearance, elastic wave and deformation are the key factors of the dynamic repeatability precision of the BDC.

High Speed Weld Control System of Dual-Bypass MIG Based on LabVIEW

2010 ◽  
Vol 139-141 ◽  
pp. 1852-1855
Author(s):  
Cheng Xue ◽  
Yu Shi ◽  
Ding Fan ◽  
Hao Zhong ◽  
Ming Xiao Shi
Keyword(s):  
Control System ◽  
High Speed ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Mig Welding ◽  
Loop Control ◽  
Weld Formation ◽  
And Control ◽  
Control Output ◽  
Test Result

Dual-bypass MIG welding (DB-GMAW) is a new kind of high speed MIG welding with three arcs. In order to monitor the weld process and control it, a high speed weld system of DB-GMAW was built. The system was run by LabVIEW programs, including getting data of system and control output signals. The test result of system showed that all equipments could be used in the same time. Beside images of weld pool and arc, the weld voltages and currents of every part had been acquired. The signals of bypass current and weld speed also had been input TIG welding sources and worktable motor successfully. Meanwhile, the high speed weld formation had a good quality, and all of these established the closed-loop control of high speed DB-GMAW.

A New Method of Reducing Shock between Press Head and Press Disk in High Speed Lapping

2007 ◽  
Vol 24-25 ◽  
pp. 145-148 ◽  
Author(s):  
J.D. Yang ◽  
C.L. Tian ◽  
H.Y. Yang ◽  
Z.Q. Hao ◽  
Z.H. Zhu
Keyword(s):  
High Speed ◽  
New Method ◽  
Machining Accuracy ◽  
Working Pressure ◽  
The Press ◽  
Air Cushion

Considering the shock between the press head and press disk in high speed lapping is more serious, this paper proposes a new method to reduce this shock. By this method a hole is machined for air passing on the press head axis. The topper of the hole is connecting with a pressure air resource. Thus an air cushion between the press head bottom and press disk on the workpiece is produced. With the distance between them reducing gradually, the damping of air cushion on the press head increases gradually. This makes speed of the press head approaching the workpiece decrease gradually and until reach zero. The pressure of the press head acts on the press disk increases gradually from zero to working pressure, which can reduce the shock between the press head and workpiece effectively, prevent weak workpiece from destroying in lapping and improve machining accuracy and quality. This method possess the advantages of easy to carry out, simple to operate and convenient to apply.

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