Dynamic Model of a Crank Press in the Process of Braking

Jomartov, Assylbek; Tuleshov, Amandyk; Kuatova, Moldir

doi:10.1007/978-3-030-30036-4_12

Cited by 5 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, Dindorf and Wos [19] developed an energy-efficient power supply and an intelligent dynamic control system for a hydraulic forging press with the purpose of saving energy and resources. Jomartov et al [20] focused on the dynamics of the brake of a crank press. The driving system was modelled in the SimulationX software and allowed to predict ram, drive shaft and crank shaft vibrations during the braking phase.…”

Section: Introductionmentioning

confidence: 99%

A new tailored solution to predict blow efficiency and energy consumption of hammer-forging machines

Mull

Durand

Baudouin

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Energy saving has become a real issue in process management and has led to the analysis of the energy consumption of forging machines, for the purpose of optimization. This study focuses on the amount of energy lost due to machine behaviour during the forming process. A spring-mass-damping model of the machine and tools system is associated with a billet model to describe hammer-forming operations only during the forging phase. The model parameters are identified with experimental measurements of process variables during a stroke, providing parameters specifically adapted to the machine-tools system. Then, model predictions are validated by the experimental upsetting of steel and aluminium billets. The model accurately predicts forging process variables for consecutive blows with different materials. The decrease in process efficiency and the evolution from inelastic to elastic blows after several strokes on the same billet are also predicted by the model. This methodology provides a new, tailored solution that enables forging manufacturers to predict the forging energy consumption of their own machines. The approach developed in this work concerns gravity drop hammers but is also transferable to other energy-driven machines.Jean-François Mulljeanfrancois.mull@ens am.eu

show abstract

Section: Introductionmentioning

confidence: 99%

A new tailored solution to predict blow efficiency and energy consumption of hammer-forging machines

Mull

Durand

Baudouin

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Therefore, the choice of mechanism structure of the crank press is crucial for decreasing the dynamic load during operation. 7,8…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the choice of mechanism structure of the crank press is crucial for decreasing the dynamic load during operation. 7,8 Stamping accuracy is an important parameter of a crank press. The stamping accuracy of a crank press generally depends on two factors, that is, the inclination of the slide under the influence of an eccentric application of the deforming force and the total linear elastic deformation of the construction units of the press and the stamps under the load, which depends on the rigidity of the press structure and stamps.…”

Section: Introductionmentioning

confidence: 99%

Kinetostatic analysis, manufacturing, and experimental application of a press machine based on Stephenson II mechanism

Jomartov¹,

Halicioglu²,

Kuatova

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

Self Cite

View full text Add to dashboard Cite

Press machine tools are often used in important industrial establishments, such as automobiles, aerospace, and aviation; these machine tools must be produced with high precision. Therefore, studies related to improving press tools and enhancing their precision are being conducted. In this study, a press machine tool based on the Stephenson II mechanism is proposed. Compared to that of conventional crank presses, this mechanism increases the slider balance using a ternary link and unique connecting rods. Thus, the slider precision can be improved with a small addition to the mechanism, and load transmission can be ensured in a balanced manner. To test the contribution of the mechanism, dynamic analysis is performed using the kinetostatic method, and the dynamic data of the mechanism are obtained. Subsequently, a press machine prototype is designed and manufactured. The experimental results are verified against the theoretical results, confirming that the proposed press machine tool based on the Stephenson II mechanism has better characteristics than those of the conventional press machine owing to the favorable distribution of forces on the slide and lower reaction to the slide guides.

show abstract

“…The difficult choice of the method for cutting of the rolled stocks into billets is caused by the fact that often the solution to this problem is multioptional, the choice of one option is not obvious and is often based on engineering intuition and practical experience. Besides, decisions are made in the context of capacity constraints, limited material resources, economic opportunities, energy resources, availability of qualified personnel, transportation costs, cooperation opportunities, preproduction time [19][20][21][22].…”

mentioning

confidence: 99%

Original Research the use of a Neural Network Classifier of Material Facture Criteria for the Rational Choice of the Method for Cutting of Rolled Stocks

Karnaukh

Марков

Kukhar

et al. 2021

Preprint

View full text Add to dashboard Cite

To select a rational method for cutting of rolled stocks made from materials with different physical and mathematical properties, an engineer must have the tools to make such a choice. For this, it is proposed to use the well-known synergistic material fracture criteria. In order to find the most informative system of synergetic criteria allowing to classify materials authentically by their fracture sensitivity, the software was developed. It allows to solve the clustering problem in a multidimensional space of parameters and present the obtained information in a visual form using self-organizing Kohonen maps. The cluster analysis of the synergetic criteria of fracture material was carried out. The most informative criterion among the ones characterizing the mechanical properties of steels is the «offset yield strength», among the synergistic ones – «scale criterion». At the same time, among the traditional mechanical features of steels, a set allowing to classify materials with a given integrity by their cutting sensitivity has not been found. It was established that the synergistic criteria: «crack propagation criterion» and «brittleness criterion» are basic informative features. When adding any of the remaining complex criteria («crack nucleation criterion» or «scale criterion»), they form the most informative sets of minimal power, providing the classification of materials by their cutting sensitivity with a given integrity. In order to obtain high quality billets at a minimum conversion cost, recommendations were developed for choice of the method for cutting of rolled stocks in magnitude of criteria values: «crack propagation criterion» and «brittleness criterion». To cut materials «in plastic state», the cutting with a shear should be used, specifically – a closed cut-off scheme or an incompletely closed cut-off scheme with an active transverse clamp or a cut-off scheme with a differentiated rolling clamp. If increased requirements are imposed on the geometric accuracy of the billets, it is recommended to use complex blanking and cutting processes. For cutting materials «in elastoplastic state» there are good reasons to use a cut with a shear, and in particular – an incompletely closed cut-off scheme with an active and passive transverse clamp. Closer to the class interval, it is possible to apply cold bend breaking with the application of an effective stress concentrator. Cold bend breaking should be used to cut «brittle» materials. The carried out experiments confirmed the adequacy of theoretical conclusions and recommendations on the choice of a rational method for cutting of the rolled stocks to obtain high quality billets.

show abstract

Dynamic Model of a Crank Press in the Process of Braking

Cited by 5 publications

References 5 publications

A new tailored solution to predict blow efficiency and energy consumption of hammer-forging machines

A new tailored solution to predict blow efficiency and energy consumption of hammer-forging machines

Kinetostatic analysis, manufacturing, and experimental application of a press machine based on Stephenson II mechanism

Original Research the use of a Neural Network Classifier of Material Facture Criteria for the Rational Choice of the Method for Cutting of Rolled Stocks

Contact Info

Product

Resources

About