Tahir Altinbalik

Trakya University

Thermoforming is a forming technique in which petrochemical-based thermoplastics, biodegradable plastics and also plastic composites can be formed. Due to recent developments in the packaging industry, it was understood that biodegradable plastics could replace petrochemical-based engineering plastics. In this study, a biodegradable Green Polyethyl...

This study is about the mechanization and automation works carried out to improve the operational efficiency of the laser-controlled land leveling machines and to design a more precise, ergonomic, economical and reliable system. At first, the existing laser-controlled leveling shovel has been redesigned through a mechanical design thus being adapte...

The expected life of a gear is important parameter especially for the gears to secure of the mechanics of it. Related to this importance, fatigue failure is one of the most seen failures occurred on gears working under cyclic loads. It is not possible to eliminate fatigue failure effects but it is possible to reduce by appropriate materials selecti...

Finding the optimal die angle for a metal extrusion process is of great importance since it affects the quality of the extrusion products. In present study, a series of finite element simulations were carried out to investigate the influence of die angle on the extrusion temperature and extrusion load. Six different die angles; 15, 30, 60, 90, 120...

Lateral extrusion was introduced as a branch of extrusion in which the workpiece material contained in an injection chamber is injected into a die cavity in a form which is prescribed by the exit geometry and it can be explained by combined axial and radial flow of material to fill the die cavity. Lateral extrusion has several advantages, such as l...

The main purpose of this research is to investigate the minimum deformation load by selecting a suitable forming method for manufacturing of gear-like sections and to compare the load estimation methods between Upper Bound Analysis and DEFORM-3D. Forward and lateral extrusion were chosen as two different forming methods. The effect of die transitio...

This paper deals with the extrusion of gear-like profiles and uses of finite element method (FEM) and artificial neural network (ANN) to predict the extrusion load. In the study, gear-like components has been manufactured by forward extrusion for the AA1070 aluminum alloy and the process was simulated by using a DEFORM-3D software package to establ...

This article covers an applied study on the computer-aided engineering analysis of the damage occurring in the disc bearing profiles of a disc harrow used in the agricultural sector and redesigning the existing structure.The damage to the machine had occurred in the form of deformation of the plastic structure in the disk-bearing profiles. In order...

Lateral extrusion, sometimes called injection upsetting, offers a product with central boss section having complete or segmented protrusions. Collar flanges, spur gear forms, spline or taper with shaft are examples of the products of produce by lateral extrusion. The aim of this study is to investigate the lateral extrusion of gear-like spline form...

Lateral extrusion, which requires less forming load comparing the closed-die forging, has been presenting a gradually increasing field of application as a type of metal forming wherein advantageous of forging and extrusion are combined. In this study production of a work piece with a single tapered tooth manufactured by the lateral extrusion method...

The aim of this research is the reduction in deformation load, improvement of the mechanical properties of the product by means of an optimum forming process and die profile. Forward extrusion and lateral extrusion were chosen as two different forming methods to manufacture a spur gear form.Four different die geometries were chosen for the forward...

The aim was to redesign and manufacture of a shovel for a pull-type land levelling machine, which, in its present condition, is used to get easily damaged even under low loads. Firstly, the maximum pulling load affecting the levelling shovel was experimentally determined. Then, stable-shovel system with the bolt connection was replaced with a beari...

The effect of die inlet and transition geometry on the extrusion loads and material flow for extrusion of clover sections were investigated and presented both theoretically and experimentally. For this purpose, four different die geometries including straight tapered and cosine transition profile and each of them having round and clover inlet geome...

This study is related to an application of assembly structural stress analyses by using CATIA genarative structural analysis workbench. Advantages and applicability of assembled structural stress analysis compared to part analysis studied by experimentally. Our stance is that analyzing a certain part of a complex assembly system taking into consid...

The aim of this work is to investigate the barreling of aluminium cylinders having two different aspect ratios in terms of barrel profiles and required loads. A modified upper bound solution including a dimensionless optimizing parameter for uniaxial upsetting has been developed and the loads calculated thereby have been compared with the results o...

Some results of an industrial research and development project aimed to develop the manufacturing technologies of gear pumps were presented. Gear blanks of gear pumps that have traditionally been produced by machining from round bars in an industrial company were closed-die forged as an alternative. A comparison method of mechanical properties of t...

The finite element method has become a powerful tool for the numerical solution of a wide range of engineering problems. In this method of analysis, a complex region defining a continuum is discretized into simple geometric shapes called finite elements. On the other hand study of extrusion process has been of interest for long time due to its in...

Forward extrusion of clover section from different billet diameters has been investigated. The die profile is given by radius function to construct the new kinematically admissible velocity fields for three dimensional extrusion and then by using the upper bound method total extrusion loads are obtained. In the experimental studies, lead billets wh...

The aim of this study is to investigate the lateral extrusion of tapered in terms of die filling and barrel formation at the front of tooth. A series of experiments has been carried out using solid lead billets with two different billet diameters and three different billet heights of each diameter. Metal flow in the tooth region is not uniform and...

The aim of this study is to investigate the lateral extrusion of splines in terms of load requirement and die filling. The prediction of forming load and pressure is an important task in metal forming. The upper bound method has been employed to investigate the load requirement for different process parameters, to this effect, kinematically admissi...

Çok geniş uygulama sahası olan dişli çarkların yüksek mukavemetli, iyi yüzey kalitesinde ve dar toleranslarda işlenmesi endüstriyel bir gereksinimdir. Kapalı kalıpla dövme yöntemine benzeyen ve nispeten düşük kuvvetlere ihtiyaç duyan enjeksiyon yığma yöntemi, iyi bir net ölçülere yakın dövme prosesi olup dişli çarkların dövülmesinde tercih ed...

An upper bound solution for lateral extrusion of spline and spur gear forms has been developed. A simple kinematically admissible velocity field with optimization parameter is proposed. From the proposed velocity field the upper bound solution on relative punch pressure and extrusion load are determined with respect to chosen process parameters. Th...

In this paper, an experimental study has been carried out to investigate the effectiveness of the usage of the open die indented specimen as preforms of conventional closed die forging. Cylindrical billets having two different aspect ratios (H0/D0) are indented with two different ratios and thereafter forged using a conventional closed-die set-up....

This study deals with the applicability of a single tooth bending fatigue test in the evaluation of gear blank manufacturing methods using three point bending loading. The “single tooth bending test” is an effective and rapid way of determination of the performances of gears instead of expensive and time-consuming life tests. Bending tests were app...

Metal flow of extrusion-forging process is similar to that of the initial pre-forging of closed-die forging and the process is frequently preferred in the forming process of high strength parts. In many metal forming processes such as closed-die forging or extrusion/forging, the deforming material changes its flow direction at various stages during...