Analytical Synthesis and Study of the Functional Capabilities of the Stephenson II Mechanism for Crank Presses

Tuleshov, Amandyk; Akhmetova, Balzhan; Merkibayeva, Bakhyt

doi:10.18178/ijmerr.11.11.850-857

Cited by 1 publication

(2 citation statements)

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“…The mechanism belongs to the fourth class according to the classification of I.I. Artobolevsky [7], since the driven kinematic chain contains a four-sided closed loop and the structural group (2,3,4,5,6,7) does not break up into groups of a smaller order.…”

Section: Kinematic Analysismentioning

confidence: 99%

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Numerical Experiment and Design of a Two-Rod Crank Knee Press with an Internal Layout of the Motor Drive

Tuleshov,

Akhmetova,

Kuatova

et al. 2023

Preprint

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In crank presses, an important role is played by the presence of actuators with dwell, in which, with continuous movement of the input links, the output working link remains stationary at some part of the work. The use of a high-class structural group (fourth class) expands the functionality of the crank press, including it can ensure the link dwell of the working link on a given section of movement during the required period of time. As a result of the conducted research, four variants of actuators of the crank knee press were designed. Due to the rational choice of the positions of racks and crosshead guide, the best layout of the dimensions of the press mechanism has been achieved, changing the coordinates of the racks accordingly allows to design a mechanism with upper or lower dwells of the working links. When synthesizing (selecting) parameters such as: l_2 and h, it is possible to obtain a height of different duration. All this is shown on the basis of a numerical experiment based on kinematic analysis. In addition, the complex structure of the mechanism makes it possible to ensure the exact link dwell, which cannot be achieved due to the well-known knee presses based on the second-class mechanism [21].

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Section: Kinematic Analysismentioning

confidence: 99%

“…The output link 7 (slider) remains stationary 𝑡 = 4, 04 𝑠. Figure6(a), which amounts 1/3 T -total working cycle time. In some crank presses, there are requirements when it is necessary to ensure rapid compression of the forging and a long reverse of slide stroke[4,6]. Such a process can be provided by this structure of the crank press mechanism.…”

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confidence: 99%