O. Tovstukha, A. Kosmach
Ukraine, Chernihiv, CHNUT
Possibilities of kinematic analysis of the technical system in software SolidWorks were considered. The simulation result revealed that modification of the construction of the mechanism for changing the baseline and correct operation requires updating the size of individual units that can be used when working with technical systems of different dimensions and kinematic.
To analyze the kinematics mechanism was used machine software environment of SolidWorks, which has two independent modules: Cosmos Motion and sketch blocks. This paper was considered only for block structure (sketch blocks).
As an object of study was chosen device is intended for the treatment of surfaces symmetrical workpieces on the machine normal accuracy. It consists of lever mechanisms and actuators. Linear displacement rod cylinder triggers the lever mechanisms that are moved symmetrically prismatic customizable constituent elements to the surface of the work piece.
There were elements of machine motion simulation for different lengths of links lever mechanism that changed within R = 30 ... 70 mm increments ΔR = 10 mm (Fig. 1).
Fig.1. Sizes parts of the mechanism that determined when simulating its movement using modular structures
When modeling the movement of parts of the mechanism was defined relationship between the size of piston displacement L and the distance between the constituent elements of H, mismatch plane of symmetry of the work piece and the axis of rotation of the lever mechanism Δ, angles between the links of the mechanism and W-axis angle Pneumatic Q. To build dependencies mechanism seen 7 provisions that take into account the maximum operating displacement piston actuators, which amounted to 119 mm.
The relationship between the size of the piston displacement L and the distance between the constituent elements of H is shown in Fig. 2. It was established that the dependence H = f (L) is non-linear nature of growing importance for every level R lever mechanism. This increase in size link leads to an increase in R value of the distance and velocity of the constituent elements of the device H. From Fig. 2 also shows that the velocity of the constituent elements increases to minimum displacement piston actuators L.
Fig.2. The dependences of the distance between the constituent elements of the device H and L piston moving at different lengths links R
The dependence between the size of the piston displacement angle L and W parts of the mechanism of rotation axis Q to R = 30 mm was shown in Fig. 3. Established that the dependence W = f (L) and Q = f (L) are nonlinear level values for each lever mechanism R. Moreover, for the other values of the total increase in R values the total increase W and Q are same, and differs only in the initial value of angles. From Fig. 3 shows that the velocity of the larger parts of the mechanism for minimum displacement piston actuators L, confirming the results that were obtained before. With dependence Q = f (L) also shows that the movement of the rod end sections (165 ... 190 mm) pneumatic position virtually unchanged.
Fig.3. Dependences of angles change W and Q parts of the mechanism for L
From Fig. 4 shows that increasing the size of the stroke actuators is increasing mismatch plane of symmetry of the work piece and the axis of rotation of the lever mechanism, which can be up to 3.5 mm in size level R = 80 mm. To minimize the impact of mismatch plane of symmetry of the work piece is necessary to sort pieces by size for a given size of R link mechanism.
Fig.4. Dependencies changes mismatch plane of the work piece and the axis of rotation of the lever mechanism Δ value and piston displacement L to R units of different sizes
For example, for R = 30 mm size stroke should be close to 69 mm, which corresponds to the width of the work piece within 227 mm, and for R = 60 mm size stroke should be close to 109 mm, which corresponds to the width of the work piece within 289 mm .
Thus, the considered simulation of the device to interactively identify important details dimensional relationships and hold them fast kinematic analysis.
Тридцять четверта Міжнародна науково-практична конференція "Інноваційний потенціал світової науки - ХХI сторіччя"
(13 - 17 жовтня 2015 року)
1. Planchard C. D. Assembly Modeling with SolidWorks / C. D. Planchard, M. P. Planchard // SDC Publications, 2012. – 528 p. http://dx.doi.org/10.1142/9781848167025_0007
2. Xiaobin D. The Design on Automatic Feed Punching Mechanism on SolidWorks / D. Xiaobin, H. Wu, H. Liu // Advanced Materials Research, 2013. – Vols. 655-657. – P. 272–276.
3. Kamil P. Effective work in design of new product in MCAD systems / P. Kamil, A. Łukaszewicz // Machine Dynamics Research. – 2013. – Vol. 37. – No 3. – P. 45–52. http://dx.doi.org/10.1016/j.cad.2014.10.001
4. Łukaszewicz A. Modelling of solid part using multibody techniques in parametric CAD systems / A. Łukaszewicz // Solid State Phenomena. – 2009. – Vols. 147-149. – P. 924–929. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.924