Design of Nonoverconstrained Energy-Efficient Multi-Axis Servo Presses for Deep-Drawing Applications1

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Francesco Meoni ◽  
Marco Carricato
Keyword(s):  
Energy Efficiency ◽  
Load Capacity ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Hydraulic Press ◽  
Ball Screw ◽  
Parallel Mechanisms ◽  
Modular Architecture ◽  
Servo Press ◽  
High Load Capacity

Servo-actuated presses may provide maximum pressing force at any ram position in the same manner that hydraulic presses do, while offering several benefits in terms of precision, energy-conversion efficiency, and simplicity, due to their lack of hydraulic circuitry and oil. Several press builders have developed servo-actuated presses; however, issues relating to overconstrained multi-axis architecture have been disregarded. This study proposes an innovative method to avoid overconstrained architectures in multi-axis presses, by implementing a family of modular parallel mechanisms that connect multiple servo-axes to the press ram. Parallel mechanisms, which can be applied in several fields of robotics and industrial automation, exhibit important benefits for the application at hand, including high-load capacity, stiffness, and compactness. A biaxial industrial servo press prototype with a nonoverconstrained and modular architecture was built and presented as a proof of concept. Each axis comprises a servomotor, a gearbox reducer, and a ball-screw transmission. It is shown that such a press may be constructed from commercially available components, achieving high energy efficiency and high press force with relatively simple construction. A direct comparison with an equivalent hydraulic-press model is carried out, thus highlighting the servo press energy efficiency.

A Multi-Axis Deep Drawing Servo Press With Non-Overconstrained Architecture

2014 ◽  
Author(s):  
Francesco Meoni ◽  
Adrian Lutey ◽  
Alessandro Fortunato ◽  
Marco Carricato
Keyword(s):  
Kinematic Chain ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Ball Screw ◽  
Proof Of Concept ◽  
Innovative Method ◽  
Servo Press ◽  
Under Construction ◽  
Servo Axis ◽  
Kinematic Mechanism

Servo actuated presses can provide maximum pressing force at any slide position in the same manner that hydraulic presses do, while offering several benefits in terms of precision, energy conversion efficiency and simplicity due to their lack of hydraulic circuitry and oil. Several press builders have developed electric-spindle actuated presses; however, issues relating to multi-axis architecture have been neglected. The present study proposes an innovative method of avoiding overconstrained architecture by implementing a kinematic mechanism that connects multiple servo axes to one slide. Servo axis design is developed by creating a dynamic model of a kinematic chain composed of a servo-motor, gearbox reducer and ball screw transmission. A study of a biaxial industrial servo press prototype with non-overconstrained architecture, currently under construction, is presented as proof of concept. It is shown that such a non-overconstrained multi-axis press can be constructed from commercially available components, achieving high energy efficiency at high load with relatively simple construction.

scholarly journals High load capacity spur gears with conchoidal path of contact

2021 ◽  
Vol 22 ◽  
pp. 47
Author(s):  
Pavlo Tkach ◽  
Pavlo Nosko ◽  
Oleksandr Bashta ◽  
Yurii Tsybrii ◽  
Oleksii Nosko
Keyword(s):  
Energy Efficiency ◽  
Load Capacity ◽  
Active Power ◽  
High Load ◽  
Spur Gears ◽  
Gear Pair ◽  
Test Rig ◽  
Experimental Approaches ◽  
High Load Capacity ◽  
Theoretical Results

The present study is devoted to investigation of spur gears with a conchoidal path of contact and a convex-convex contact between teeth. The load capacity and energy efficiency were evaluated using both theoretical and experimental approaches. The theoretical analysis showed that the conchoidal gear pairs are 5–21% stronger in terms of contact stress and have similar energy efficiency as compared to the involute gear pairs of the same configuration. Experiments were conducted on a gear test rig. Its energy efficiency was determined by measuring the active power of the motor driving the pinion shaft and controlling the torque at the gear shaft. The load capacity of the tested gear pair was estimated by analysing changes in the energy efficiency. It was found that the conchoidal gear pair has more than 20% higher load capacity and slightly higher energy efficiency, which agrees well with the mentioned theoretical results. Thereby, the study concludes a substantially higher load capacity of the conchoidal gears compared to the traditional involute ones.

scholarly journals A Novel Energy-Efficient Wobble Plate Hydraulic Joint for Mobile Robotic Manipulators

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2915
Author(s):  
Delei Fang ◽  
Junhong Yang ◽  
Jianzhong Shang ◽  
Zhuo Wang ◽  
Yong Feng
Keyword(s):  
Energy Efficiency ◽  
Energy Efficient ◽  
Structural Characteristics ◽  
Load Capacity ◽  
Hydraulic Drive ◽  
Operation Time ◽  
Robotic Manipulators ◽  
High Energy ◽  
Load Matching ◽  
System Energy

At present, mobile robotic manipulators have been greatly developed. However, these further promotions are limited by a low load capacity and short operation time. The above problems can be improved by using a hydraulic drive mode and increasing the system energy efficiency. In this paper, a novel energy-efficient wobble plate hydraulic joint is presented, which has the characteristics of having a small size, lightweight, large load capacity, and high energy efficiency. Based on the efficiency analysis in traditional robotic manipulators, this paper presents a novel hydraulic joint with a multi-chamber drive structure. Kinematics model and dynamics model are both established for the analysis of the mechanical characteristics, and the functional relationship between the input and output is depicted by numerical simulation. Based on the structural characteristics and control principle, the load matching controller is designed and specific control processes are formulated. Combined with a strategy of load matching, the servo control system is established and the energy-saving effect is verified by simulation. The result shows that the wobble plate hydraulic joint can change connections between a high-pressure circuit and different working chambers, which realizes the match between the output torque and load torque. With the load matching controller, the energy consumption of the wobble plate joint is greatly reduced, which contributes to a considerably improved energy efficiency. The research in this paper not only lays a theoretical foundation for the development of a wobble plate hydraulic joint, but also provides guidance for the improvement of the hydraulic system energy efficiency in mobile robotic manipulators.

scholarly journals Research On Energy Saving and Performance Enhancement of High-End Hydraulic Press With Controllable Accumulator

2021 ◽  
Author(s):  
Lin Hua ◽  
Zhicheng Xu ◽  
Yanxiong Liu ◽  
Xinhao Zhao
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Production Efficiency ◽  
Performance Enhancement ◽  
Mathematic Model ◽  
High Energy ◽  
Hydraulic Press ◽  
Traditional System ◽  
Working Cycle ◽  
Working Performance

Abstract Hydraulic fineblanking press is a kind of high-end hydraulic metal forming devices and widely applied in automotive and appliance industry. However, it suffers from the defeat of high energy consumption low energy efficiency. To solve the problem, this study proposed a power-matching strategy by using a novel controllable accumulator which can control the precharge pressure, output flow with high precision. Firstly, the energy characteristics and working performance requirements of the large-sized fineblanking press in a working cycle were investigated. Then, the energy consumption mathematic model coupling with the controllable accumulator was built for designing the key parameters of the accumulators. Based on the load characteristic and the energy model, a controlling strategy of the controllable accumulator was proposed to reduce the imbalance degree of the supplied and demanded power and improve working performance by designing working route of the controllable accumulator. Finally, a detailed hydraulic schematic was designed and applied on the 1000 ton hydraulic fineblanking press, which was validated with simulation model. The results show that compared to the traditional system, the energy efficiency of the novel system is improved by 20.35% with lowering the input energy by 169.4 kJ. Besides, the vibration magnitude of the slide block is decreased a lot and the working production efficiency is improved by 10% compared to the traditional system.

A New Device for Converting Rotary Motion into Linear Motion Study of Rotary-to-Linear Harmonic Drive® (Harmonic Linear Drive®)

2008 ◽  
Vol 20 (2) ◽  
pp. 311-315
Author(s):  
Stéphanie Moune ◽  
◽  
Keiji Ueura ◽  
Noboru Takizawa
Keyword(s):  
Load Capacity ◽  
Ball Screw ◽  
Linear Motion ◽  
Harmonic Drive ◽  
New Device ◽  
Motion Study ◽  
Input Side ◽  
Drive Systems ◽  
High Load Capacity ◽  
Screw Threads

This paper describes a new concept for linear motion based on the similar theory of strain wave gearing, which has been used for more than forty years by Harmonic Drive Systems Inc. Gear teeth are replaced by screw threads and rotation of the input side generates linear translation at the output. Besides design flexibility and reasonable costs, the new rotary-to-linear harmonic drive® has shown promising potential in positioning accuracy as well as in high load capacity. It is able to compete (and to surpass in some features) with ball screw or lead screw systems.

scholarly journals Design and Performance of Nonlinear Control for an Electro-Hydraulic Actuator Considering a Wearable Robot

Processes ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 389 ◽  
Author(s):  
Song ◽  
Lee ◽  
Park ◽  
Baek
Keyword(s):  
Sliding Mode ◽  
Load Capacity ◽  
High Energy ◽  
Adaptive Sliding Mode Control ◽  
Hydraulic Systems ◽  
Hydraulic Actuator ◽  
Wearable Robot ◽  
Wearable Robots ◽  
And Performance ◽  
High Load Capacity

In the development of a wearable robot, compact volume size, high energy efficiency, and a high load capacity linear actuator system are necessary. However, conventional hydraulic actuator systems are difficult to apply to wearable robots. Also, they have nonlinearities because of the presence of hydraulic fluid in a single rod cylinder. Electric linear actuators resolve the problems of hydraulic systems. However, due to their low load capacity, they are not easy to apply to wearable robots. In this paper, a pump-controlled electro-hydraulic actuator (EHA) system that considers the disadvantages of the hydraulic actuator and electric actuator is proposed for a wearable robot. Initially, a locking circuit design is considered for the EHA to give the system load holding capacity. Based on the developed model, the adaptive sliding mode control (ASMC) scheme is designed to resolve the nonlinearity problem of changes in the dynamic system. The ASMC scheme is then modeled and verified with Simulink. In order to verify the performance of the proposed adaptive control with the model, experiments are conducted. The proposed EHA verifies that the ASMC reaches the target value well despite the existence of many model uncertainties.

Reactions in Activated Peroxide Systems and their Influences on Bleaching Performance

2020 ◽  
Vol 17 ◽  
Author(s):  
Xiaoyan Wang ◽  
Jinmei Du ◽  
Changhai Xu
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Energy Efficiency ◽  
Textile Industry ◽  
High Energy ◽  
Side Reactions ◽  
Competitive Reactions ◽  
High Energy Efficiency ◽  
Hydrolysis Of ◽  
Bleach Activators

Abstract:: Activated peroxide systems are formed by adding so-called bleach activators to aqueous solution of hydrogen peroxide, developed in the seventies of the last century for use in domestic laundry for their high energy efficiency and introduced at the beginning of the 21st century to the textile industry as an approach toward overcoming the extensive energy consumption in bleaching. In activated peroxide systems, bleach activators undergo perhydrolysis to generate more kinetically active peracids that enable bleaching under milder conditions while hydrolysis of bleach activators and decomposition of peracids may occur as side reactions to weaken the bleaching efficiency. This mini-review aims to summarize these competitive reactions in activated peroxide systems and their influence on bleaching performance.

Current progress and performance improvement of Pt/C catalysts for fuel cells

2020 ◽  
Vol 8 (46) ◽  
pp. 24284-24306
Author(s):  
Xuefeng Ren ◽  
Yiran Wang ◽  
Anmin Liu ◽  
Zhihong Zhang ◽  
Qianyuan Lv ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Energy Conversion ◽  
Performance Improvement ◽  
Electric Energy ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Carnot Cycle ◽  
High Energy Conversion Efficiency ◽  
And Performance

Fuel cell is an electrochemical device, which can directly convert the chemical energy of fuel into electric energy, without heat process, not limited by Carnot cycle, high energy conversion efficiency, no noise and pollution.

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