Prediction of Cutting Time When Crosscutting Rounds, Pipe, and Rectangular Bar With a Gravity Fed Portable Bandsaw

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Amrit Sagar ◽  
Thomas P. James
Keyword(s):  
Thrust Force ◽  
Mechanistic Model ◽  
Applied Pressure ◽  
Low Carbon Steel ◽  
Lithium Ion ◽  
Low Carbon ◽  
Workpiece Material ◽  
Cross Sectional ◽  
Cutting Rate

Portable bandsaws are gaining in popularity for their use on remote jobsites to efficiently cut structural materials such as bar, pipe, and channel. Some of their increased popularity is due to the recent introduction of high watt-hour lithium ion batteries, which has further improved the portability of bandsaws by making them cordless. However, with cordless bandsaws, knowledge of cutting rates becomes more important as battery runtime limits productivity. Unlike industrial cutoff bandsaws that typically have feed rate control, the cutting rate of portable bandsaws is determined by operator applied pressure and gravity. While some research has highlighted the cutting mechanics of bandsaws and related wear processes, there is a lack of progress in the area of predicting cutoff time as a function of sawing parameters, such as applied thrust force, blade speed, workpiece material properties, and geometry of the cross section. Research was conducted to develop and experimentally verify a mechanistic model to predict cutting rates of various cross sectional geometries with a gravity fed portable bandsaw. The analytical model relies upon experimental determination of a cutting constant equation, which was developed for a low carbon steel workpiece cut with an 18 teeth per inch (TPI) blade. The model was employed to predict crosscutting times for steel rounds, squares, and tubes for several conditions of thrust force and blade speed. Model predictions of cutting time were in close agreement with experimental results.

A Prediction of Total Cutting Time When Crosscutting Rounds, Pipe, and Rectangular Bar With a Portable Bandsaw

2012 ◽  
Author(s):  
Thomas P. James ◽  
Amrit Sagar ◽  
Joseph P. Domblesky
Keyword(s):  
Cross Sections ◽  
Feed Rate ◽  
Thrust Force ◽  
Mechanistic Model ◽  
Applied Pressure ◽  
Lithium Ion ◽  
Steel Tube ◽  
Workpiece Material ◽  
Software Application ◽  
Time Required

Portable bandsaws are gaining in popularity for their use on jobsites to efficiently crosscut structural materials such as bar, pipe, angle, and channel. Some of the increased popularity is also due to the recent introduction of lithium ion batteries, which has further improved the portability of bandsaws by making them cordless. However, with cordless portable bandsaws, knowledge of cutting rates becomes more important as battery runtime limits productivity. Unlike industrial bandsaws that typically have feed rate control, portable bandsaws use operator applied pressure and gravity to control feed rate. While some research has highlighted the cutting mechanics of bandsaws and related wear processes, there is a lack of progress in the area of predicting total cutting time as a function of sawing parameters, such as applied thrust force, blade speed, workpiece material properties, and geometry of the cross section. This paper presents research that was conducted to develop and experimentally verify a mechanistic model to predict cutting rates of various cross sections with a gravity fed portable bandsaw. The model was used to predict the time required to cut steel tube for several conditions of thrust force and blade speed. Model predictions were verified by experiment to a reasonable degree of accuracy. The model serves as the algorithm for a software application to assist contractors in developing jobsite estimates of time and material.

scholarly journals The impact of exploitation and environmental factors on the degradation of steel road safety equipment

2018 ◽  
Vol 231 ◽  
pp. 01012
Author(s):  
Joanna Kobus ◽  
Lech Kwiatkowski ◽  
Rafał Lutze
Keyword(s):  
Road Safety ◽  
Zinc Coating ◽  
Low Carbon Steel ◽  
Environmental Parameters ◽  
Galvanized Steel ◽  
Traffic Intensity ◽  
Low Carbon ◽  
Zinc Corrosion ◽  
The Impact

The work is aimed at determining the corrosivity of atmosphere in the vicinity of roads, taking into account the characteristics of local emission sources, including traffic intensity of vehicles along with climatic and exploitation factors. Determination of the corrosivity of atmosphere was carried out according to the procedures described in PN EN ISO standards. Samples for testing were made of low carbon steel DC05, zinc and hot dip galvanized steel. Samples were assembled at 19 sites in the close vicinity of roads and highways near the measurement points of vehicle traffic intensity. The mass loss of exposed samples was the basis for determination the atmosphere corrosivity at each of 19 test sites. Regarding steel, the corrosivity category of C4 was observed at 8/19 sites. Corrosion losses outside roads are 2-4 times lower and ranged within the categories of C2 and C3. Zinc corrosion losses classified to category C4 occurred at 2/19 stations. In the remaining ones they corresponded to category C3. In areas outside of roads, zinc corrosion losses are about 20-100% lower (C2). The first attempts to model the dependence of operating and environmental parameters on zinc and zinc coating corrosion losses indicate significant correlation between zinc and zinc coating corrosion losses as a function.

Weld Contour Measurement of Fillet Weld by Reverse Engineering Technique

Volume 3 ◽  
2004 ◽  
Author(s):  
Chia-Lung Chang ◽  
Yen-Hung Chen
Keyword(s):  
Reverse Engineering ◽  
Laser Scanning ◽  
Rapid Assessment ◽  
Low Carbon Steel ◽  
Scanning System ◽  
Low Carbon ◽  
Cross Sectional ◽  
Fillet Weld ◽  
Premature Failure ◽  
Engineering Technique

The external geometry of the fillet weld plays an important role in the strength of the weld. Two factors that influence the external geometry of the fillet weld are weld size and profile. The fillet weld must be made to the weld size and profile as specified in the welding code. Unacceptable profile not only is a defect of the weld but also produces stress risers that reduce the fatigue strength. Insufficient weld that reduces the cross sectional area of weld throat may cause premature failure. Visual inspection and weld gages are two most widely used simple tools to provide a rapid assessment of the external geometry of the fillet weld. In this study, the reverse engineering technique, which a laser scanning system integrates with CAD software, is used to provide a more accurate measurement of the weld contour. The weld samples were made of low-carbon steel plates with T-joint using CO2 welding. The weld volume, weld size and convexity were determined from CAD model to evaluate the weld quality. The reverse engineering technique provides a more accurate and efficient method to inspect the external geometry of fillet weld.

Cold extrusion of conical cups with cylindrical cavity

2016 ◽  
Vol 1 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Н. Коробова ◽  
N. Korobova ◽  
А. Дмитриев ◽  
A. Dmitriev ◽  
Н. Толмачев ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Cold Extrusion ◽  
Extrusion Force ◽  
Low Carbon ◽  
Cylindrical Punch ◽  
The Mathematical Model

The method and results of the study of reverse extrusion of billet by cylindrical punch in a conical expanding matrix are described. The mathematical model, which we developed for the determination of specific extrusion force, is described too. The study by statistical method verified the adequacy of the model. This model made possible to assess the resistance of punches and showed the ability to produce deformation of a billet made of low carbon steel without heating. The developed process includes the operation of segmenting of the cylindrical workpieces from bar, heat treatment, lubrication and extrusion of the workpieces. The two-way cold extrusion of a billet is produced in a matrix alternatively by two punches. The design of the stamp is described. The stamp is specialized for reverse extrusion of a billet. In its construction the moving mechanism of action of the two alternately punches in one matrix is used.

scholarly journals The Variation Effect of Electric Current Toward Tensile Strength on Low Carbon Steel Welding with Electrode E7018

Teknomekanik ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 9-16
Author(s):  
Muhammad Agung Pratomo ◽  
Jasman Jasman ◽  
Nelvi Erizon ◽  
Yolli Fernanda
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
High Current ◽  
Low Carbon ◽  
Polarity Determination ◽  
Good Penetration ◽  
Electric Polarity ◽  
Selection Of

The strength of the welding result is strongly influenced by several factors, one of which is the selection of high current. This study aims to determine the effect of high current of welding on the strength of low carbon steel welding joints. The process of welding the material uses the open V seam connection type. The variations of the high current used were 80 A, 100 A and 130 A. The specimen used was a carbon steel plate with code of 1.0038 with thickness of 8 mm and the electrode used was the E7018 electrode with diameter of 3.2 mm. The strength of the welding results is influenced by arc voltage, amount of current, welding speed, amount of penetration and electric polarity. Determination of the amount of current in metal joints using arc welding affects the work efficiency and welding materials. Based on the research, it was found that welding using high current of 100 ampere produced the highest tensile strength value of all test specimens that were given welding treatment and good penetration results.

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