Optimum design of a novel press system with Stephenson-I mechanism

Hsieh, Wen-Hsiang; Tsai, Chia-Heng

doi:10.1016/j.camwa.2012.01.052

Cited by 8 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Stevenson six-bar press mechanism [9], has a binary link as its ground link, and consists of two loops defined by joint coordinates: (i) a 4-bar linkage 𝑂𝑂 2 𝐴𝐴𝐵𝐵𝑂𝑂 4 , and (ii) a slider crank linkage 𝑂𝑂 2 𝐴𝐴𝐴𝐴𝐴𝐴. We start from the press, whose dimensions are 𝑟𝑟 1 = 400, 𝑟𝑟 2 = 135.92, 𝑟𝑟 3 = 369.84, 𝑟𝑟 4 = 459.78, 𝑟𝑟 3𝑎𝑎 = 628.07, 𝑟𝑟 5 = 213.04, 𝛼𝛼 = 9.5° 𝑎𝑎𝑛𝑛𝑑𝑑 running at average crank speed 60 rpm.…”

Section: Constant Speed Crank Stevenson Mechanismmentioning

confidence: 99%

Kinematic Analysis of a Variable Speed Deep Drawing Press Using GIM Software

AlJaimaz,

AlDousari,

Ebrahem

et al. 2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

In this paper, we introduce a groundbreaking method to enhance the functionality of a Stevenson-type press by manipulating the input speed of the crank. Unlike the traditional approach of maintaining a constant input speed, we propose a novel strategy that involves varying the speed of the output sliding ram. Our approach utilizes a servomotor as the power input, allowing us to achieve the desired trajectory of the output motion by carefully designing the input speed using Bezier curves. To obtain the desired output position, velocity, and acceleration, we employ dimensional synthesis on GIM software. Design examples are given for illustration.

show abstract

Section: Constant Speed Crank Stevenson Mechanismmentioning

confidence: 99%

Kinematic Analysis of a Variable Speed Deep Drawing Press Using GIM Software

AlJaimaz,

AlDousari,

Ebrahem

et al. 2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

show abstract

“…Luo et al [5] and Xu et al [6] focused on the characteristics of Watt I and Watt II sixbar mechanisms respectively, and applied them to the walking parts of the robot, realizing the innovative application of the mechanism. In other literature, [7] the motion of a Stephenson I six-bar mechanism was analyzed, and the optimal design of the press based on a Stephenson I six-bar mechanism was completed. Plecnik and Mccarthy [8] have studied the comprehensive equation governing the behaviour of a Stephenson III six-bar mechanism, and then applied it to the analysis of a manipulator.…”

Section: Introductionmentioning

confidence: 99%

A quantitative analysis method for contact force of mechanism with a clearance joint based on entropy weight and its application in a six-bar mechanism

Chen¹,

Qian²,

Sun³

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

Contact force in a clearance joint affects the dynamic characteristics and leads to nonlinear response of the mechanism. It is necessary to assess the nonlinearity of contact force quantitatively. Therefore, a new method named contact-force entropy weight is proposed in this paper. This method presents a comprehensive description of the judgment matrix in the X, Y, and Z directions. To assess the influence degrees of different clearances and angular velocities on the contact force, the method is applied to numerical calculation and simulation of a six-bar mechanism with a clearance joint to illustrate its application and investigate the influence degree of angular velocity and clearance on the contact force. By combining the simulation results and theoretical calculations, the influence degrees of different clearances and angular velocities on the contact-force entropy weight of the six-bar mechanism with a clearance joint are revealed. It is found that the angular velocity has a significant influence on the contact force entropy weight of the clearance joint, showing that the contact-force entropy weight is a feasible new method of assessing non-linearity of contact force quantitatively. The method gives a theoretical reference for quantitatively analyzing the nonlinear dynamics.

show abstract

“…Although the working mechanism of servo press is basically the same as that of common mechanical press, their design principles are quite different, due to the different working requirements. For the common mechanical presses, the design of the working mechanisms usually focuses on the kinematic characteristics: proper and steady speed in the working stroke, meeting the requirements of the forming process [21][22][23][24]. The mechanical advantage, although mentioned in some documents for mechanism optimization, is usually not a key factor.…”

Section: Introductionmentioning

confidence: 99%

Decomposition analysis and peak stagger design for Crank-triangular linkage-elbow mechanism of mechanical servo presses

Sun

Liang-mo

et al. 2021

Mechanics & Industry

View full text Add to dashboard Cite

High mechanical advantage as well as low and steady slide speed within the working stroke Sn are the fundamental requirements for the working mechanism of servo-mechanical press. Currently, the Crank-Triangular Linkage-Elbow (CTLE) mechanism has attracted more and more attention from researchers and manufacturers of servo presses. This paper presents a new analysis and design method of CTLE. The mechanism is decomposed into two sub-units: crank and triangular-linkage elbow, followed by the kinematic and force analysis of each sub-unit. The influences of each structural parameter on the working performance are obtained and can be used as the basis for preliminary design. Through the offset design, the mechanical advantage peaks of the two units, MA1max and MA2max, do not occur at the same time: MA1max is located near Sn, while MA2max is just at BDC (Bottom Dead Center). Because the mechanical advantage of the whole mechanism is the product of the two subunits, the designed mechanism can obtain high and steady mechanical advantage together with low and steady slide speed within Sn. After preliminary design, the scheme can be further modified by numerical simulation and optimization. Hence the design efficiency can be improved.

show abstract

Optimum design of a novel press system with Stephenson-I mechanism

Cited by 8 publications

References 15 publications

Kinematic Analysis of a Variable Speed Deep Drawing Press Using GIM Software

Kinematic Analysis of a Variable Speed Deep Drawing Press Using GIM Software

A quantitative analysis method for contact force of mechanism with a clearance joint based on entropy weight and its application in a six-bar mechanism

Decomposition analysis and peak stagger design for Crank-triangular linkage-elbow mechanism of mechanical servo presses

Contact Info

Product

Resources

About