Vibration analysis of screw-fed systems used in additive manufacturing technology

Sezgin Ersoy1 , Mehmet Kaba2 , Bekir Ekinli3

1Advanced Research in Mechatronics and Artificial Intelligence, Marmara University, Aydinevler Mah. Idealtepe Yolu No: 15 34854 Maltepe, Istanbul, Turkey

1, 2Department of Mechatronics Engineering, Faculty of Technology, Marmara University, Aydinevler Mah. Idealtepe Yolu No: 15 34854 Maltepe, Istanbul, Turkey

3Enformak Design Center, İstanbul, Turkey

1Corresponding author

Vibroengineering PROCEDIA, Vol. 43, 2022, p. 109-112.
Received 21 February 2022; received in revised form 22 March 2022; accepted 8 April 2022; published 13 June 2022

57th International Conference on Vibroengineering, Istanbul, Turkey, June 13, 2022

Copyright © 2022 Sezgin Ersoy, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Additive manufacturing technology has become quite widespread and produces solutions in many areas. Although it is much more advantageous than machining, this technology continues to be developed every day to increase productivity. In additive production systems with different production processes, it may be necessary to improve the system in order to increase the quality of the products that are desired to increase the sensitivity. In this study, it is aimed to determine the vibration behavior of the screw used in the screw extruder method, which will eliminate the errors caused by the continuous filament technology used in FDM technology in layered production.

Vibration analysis of screw-fed systems used in additive manufacturing technology

Keywords: additive manufacturing, screw extrusion, vibration analysis.

1. Introduction

Additive manufacturing can produce products ranging in size from nano/micro structures [1] to macro structures [2]. The production of a nanostructure or the construction of a building is possible with this production method [3]. The advantages of additive manufacturing are not limited to the manufacturing process. At the same time, it has crucial advantages in processes such as the storage and transportation of raw materials, delivery to the production area and waste material management [4-7].

In additive manufacturing, the preparation of the product is the same as the traditional method. The product is created by software. However, production can be realized in a very advantageous way by creating a design and producing the product, disparate from the traditional method [8-12] (Fig. 1).

Fig. 1. Additive manufacturing process [8-12]

Additive manufacturing process [8-12]

Although it has many advantages, problems can be experienced in additive manufacturing technologies [13, 14]. One of these problems is the problem encountered in systems that produce continuous film. In order to eliminate this problem experienced in FDM systems, screw fed systems are started to be used instead of continuous filament fed systems. The layered production of the system, inspired by traditional plastic injection systems, is realized by applying it vertically in technology. The most probable system problem in this system is vibration-related wear, which is a type of soft wear. Adhesive removal on the system; Decreased productivity, variations in the melt quality and mixing quality, decrease in pressure stability, increase in the temperature inside the hive and increase yellowing and burning can take away the advantages of the innovative method [15-20].

In this publication, it is aimed to determine the behavior and optimum operating values of screw extrusion systems, which are developed for the elimination of frequently encountered mechanical errors in FDM technology, by vibration analysis.

2. Materials and methods

Extrusion screws are produced according to the proportional relationship between diameter and length. Parameters such as temperature and pressure, especially the type of material to be used in production, are very decisive on efficiency. In addition, the operating conditions of the system are also very important [21]. Effects such as vibration and external environment characteristics will directly affect the quality. Nitriding steel (8550) is the most widely used material as screw material in the development of screw fed system in additive manufacturing.

Nitriding steels are generally preferred where high wear resistance, high fatigue strength and high corrosion resistance are required. Nitriding steels are delivered pre-hardened between 27-35 HRc.

When using as a screw for material-layered production, a temperature of approximately 350 °C can be applied to the 40 W heater and extruder supplied by the system and supplied to the nozzle tip. The screw can withstand the bending effect up to a torque of 88.9278 N.m. In addition, the yield strength value is 680 N/m2 [21]. The vibrations that may occur in the operation of this material depending on the system parameters were investigated using the finite element analysis method.

Table 1. Nitriding steel (8550) chemical composition


3. Result and discussion

A real model has an infinite number of natural frequencies. However, a finite element model (SolidWorks) has a finite number of natural frequencies equal to the number of degrees of freedom considered in the model. Only the first few modes are needed for most applications. Natural frequencies and corresponding mode shapes depend on geometry, material properties, and support conditions. The calculation of natural frequency and mode shapes is known as modal, frequency and normal mode analysis. In layered production technology, the average of the highest natural vibration frequency values at full occupancy rate is between 150 Hz, which is the reference value for this study.

The analysis results on the screw are given in Fig. 2. According to the analysis results, the vibration values on the screw are given in Table 2.

Table 2. Modal frequency values of the screw

Mode numbers
Frequency (Hz)

Fig. 2. Frequency analysis values of the feed screw

Frequency analysis values of the feed screw

4. Conclusions

According to the results of the analysis on the material whose properties are given in the study, the vibration effect that the screw will be exposed to within the working parameters is not expected to affect the production process. The influence of the printing parameters on the natural vibration frequency is neglected.

The results show that the designed screw design is usable for all thermoplastics. However, this does not apply to metal powder added thermoplastics. Metal powders can have adhesion, friction, and wear effects.

This improved screw design is part of an innovative 3D printing system. In this study, it is seen that the vibration effect does not affect the production quality when using the extrusion model and 3D printing method.


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