Abstract
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.
Highlights
IntroductionMechanical press is the most popular forging and stamping equipment applied in industry, and its driving system includes power source (motor), reducing system and working mechanism, whose function is to convert the input rotary motion into linear reciprocating motion of the slide [1]
Mechanical press is the most popular forging and stamping equipment applied in industry, and its driving system includes power source, reducing system and working mechanism, whose function is to convert the input rotary motion into linear reciprocating motion of the slide [1].The driving system of the traditional mechanical press has a flywheel and its design is based on energy
A new design method of multi-linkage mechanism based on decomposition analysis is proposed, which provides a basis for building a preliminary model for subsequent optimization design, so as to improve the design efficiency
Summary
Mechanical press is the most popular forging and stamping equipment applied in industry, and its driving system includes power source (motor), reducing system and working mechanism, whose function is to convert the input rotary motion into linear reciprocating motion of the slide [1]. The general approach to solve the optimization problem of planar linkage system is: (1) establish the mathematical model of the system through analysis; (2) numerical simulation is conducted by proper software tools. André Höber et al developed a software for servo press transmission system design, but it is only suitable for crank and toggle mechanisms, and can only solve the kinematic simulation, without involving the optimization of the system [20]. By mathematical analysis on kinematics and dynamics of the mechanism, the general rule of the influence of the structural parameters on the performance of the mechanism can be obtained On this basis, the initial model, constraints and optimal path of the optimal design can be established, which will help to simplify the design process, obtain the optimal solution and improve the design efficiency
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