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TECHNOLOGY OF MANUFACTURING FOUNDRY CORES USING ADDITIVE METHODS 用增材制造铸造芯的技术
Pub Date : 2017-01-01 DOI: 10.7494/mafe.2017.43.3.189
P. Matysik, D. Drożyński, B. Olszowska-Sobieraj, J. Grzegorek, Piotr Bubrowski
The use of additive manufacturing methods for the production of sand cores with organic binders is currently the latest trend in small and unit production, as it allows for a quick and simple way to get a final cast part; this is known as Rapid Prototyping. In this article, manufactured additive method cores were analyzed that were made of quartz sand with furfuryl resin and cores made of synthetic sand. Derivatographic measurements were compared, and examples of the high complexity cores are shown. Furthermore, the aspect ratio of the grains was determined by microscopic observation. Each type of core was characterized by a different flexural strength and differentiated results of abrasion. The results were collected and compared.
使用增材制造方法生产含有机粘合剂的砂芯是目前小型和单位生产的最新趋势,因为它可以快速简单地获得最终铸件;这就是所谓的快速原型。本文分析了用糠酰树脂制备石英砂和合成砂制备岩心的添加剂制取方法。对衍生测量结果进行了比较,并给出了高复杂度岩心的实例。此外,还通过显微观察确定了晶粒的长径比。每种类型的岩心具有不同的抗弯强度和不同的磨损结果。收集结果并进行比较。
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引用次数: 1
Influence of time on modification effect of silumin AlSi11 with strontium and boron 时间对硅明AlSi11锶硼改性效果的影响
Pub Date : 2017-01-01 DOI: 10.7494/MAFE.2017.43.3.209
R. Romankiewicz, F. Romankiewicz
Studies on the effect of time on the modification of AlSi11 silumin with variable strontium micro additives in the form of an AlSr10 master alloy and boron in an AlB4 master alloy were investigated. The results showed that the strontium micro additive resulted in a satisfactory improvement in the a(Al) + b(Si) eutectic and an increase in tensile strength (Rm) and unit elongation (A5); this is also the case two hours after adding the modifier. The simultaneous modification of silumin with AlB4 and AlSr10 causes a strong fragmentation of the alloy grains and significant improvement in Rm and A5 (also two hours after adding the modifiers).
研究了以AlSr10为主合金形式和以alsr4为主合金形式加入可变锶微添加剂对AlSi11硅明进行改性的时间影响。结果表明:微量锶添加剂对a(Al) + b(Si)共晶有较好的改善作用,抗拉强度(Rm)和单位伸长率(A5)均有提高;添加修饰语两小时后也是如此。al4和AlSr10同时对silumin进行改性后,合金晶粒出现了强烈的碎裂,Rm和A5(也是在加入改性剂2小时后)得到了显著改善。
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引用次数: 4
INFLUENCE OF WELDING TECHNIQUES ON MICROSTRUCTURE AND HARDNESS OF STEEL JOINTS USED IN AUTOMOTIVE AIR CONDITIONERS 焊接工艺对汽车空调用钢接头显微组织和硬度的影响
Pub Date : 2017-01-01 DOI: 10.7494/MAFE.2017.43.4.281
P. Noga, M. Węglowski, P. Zimierska-Nowak, M. Richert, J. Dworak, J. Rykala
Austenitic steels belong to a group of special-purpose steels that are widely used in highly aggressive environments due to their enhanced anticorrosive behavior and high mechanical properties. The good formability and weldability of these materials has made them very popular in automotive AC systems. This study presents the results of hardness tests and microstructure observations on plasma- and laser-welded joints. The examined joints consisted of two different stainless steel components; i.e., a nipple made from corrosion-resistant AISI 304 steel and a corrugated hose made from 316L steel. Microplasma welding was carried out on a workstation equipped with an MSP-51 plasma supply system and a BY-100T positioner. The laser-welded joint was made on a numerically controlled workstation equipped with an Nd:YAG laser (without filler material) with 1 kW of maximum power; the rotational speed of the welded component was n = 4 rpm. Microstructural observations were performed using a scanning electron microscope and an optical microscope. Vickers hardness was measured with a hardness tester. The obtained results proved that both the microplasma- and laser-welded joints were free from any visible welding imperfections. In the micro areas of the austenitic steel weld, crystals of intercellular ferrite appeared against a background of austenite. The crystallization front (depending on the welding technology) was running from the fusion line towards the weld axis. The grain size depended on the distance from the fusion line.
奥氏体钢是一类特殊用途的钢,由于具有较强的抗腐蚀性能和较高的力学性能,在高腐蚀环境中得到了广泛的应用。这些材料具有良好的成形性和焊接性,在汽车交流系统中非常受欢迎。介绍了等离子体和激光焊接接头的硬度测试和显微组织观察结果。所检查的接头由两种不同的不锈钢部件组成;即,由耐腐蚀的AISI 304钢制成的接头和由316L钢制成的波纹软管。在配备MSP-51等离子体供应系统和BY-100T定位器的工作站上进行微等离子体焊接。采用最大功率为1 kW的Nd:YAG激光器(无填充材料),在数控工作台上制作激光焊接接头;焊接构件的转速为n = 4rpm。采用扫描电子显微镜和光学显微镜进行显微结构观察。用硬度计测定维氏硬度。结果表明,微等离子体和激光焊接接头均无明显的焊接缺陷。在奥氏体钢焊缝的微观区域,在奥氏体背景下出现了胞间铁素体晶体。结晶前沿(取决于焊接技术)从熔合线走向焊接轴。晶粒大小取决于与熔合线的距离。
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引用次数: 2
IMPACT OF SELECTED PARAMETERS ON EXTRACTION OF INDIUM FROM LCD SCREENS 参数选择对液晶屏中铟提取的影响
Pub Date : 2017-01-01 DOI: 10.7494/MAFE.2017.43.4.305
M. Stępień, P. Palimąka, Andżelika Bukowska
Due to the minute availability of indium and its crucial importance to the world economy, it is necessary to find alternative sources of this metal. As a large proportion of indium production is consumed for the purpose of LCD screen manufacturing, it seems reasonable to investigate their recycling leading to the recovery of this metal. The present work investigates the impact of time, temperature, and the concentration of sulfuric acid on the effectiveness of indium extraction from milled LCD panel glass scrap originating from portable computers manufactured between 2005 and 2012. The conclusion of our research defines the optimal conditions for extraction.
由于铟的稀缺及其对世界经济的重要性,有必要寻找这种金属的替代来源。由于很大一部分铟生产被用于LCD屏幕制造,因此研究其回收利用以回收这种金属似乎是合理的。本研究研究了时间、温度和硫酸浓度对从2005年至2012年生产的便携式电脑生产的LCD面板玻璃废料中提取铟的效果的影响。研究结论确定了提取的最佳条件。
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引用次数: 2
CORRELATION BETWEEN MECHANICAL PROPERTIES OF SELECTED 7XXX SERIES ALUMINUM ALLOYS OBTAINED BY SEMI-CONTINUOUS CASTING 所选7xxx系列铝合金半连续铸造力学性能的相关性
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.69
Z. Kwak, A. Garbacz-Klempka, M. Perek-Nowak, Ł. Szymański
The studied ingots were made of alloys with a similar zirconium ratio, typically be given as: EN AW-7010 [AlZn6MgCu] and EN AW-7003 [Al Zn6Mg0,8Zr], in accordance with European standard PN-EN 573-3:2014-02 English version. The symbols S and K are our internal modifications, compatible with the standard. The added zirconium was intended to improve the tensile strength resulting from plastic forming and an increasing resistance to cracking. Samples were taken from ingots made in the process of semi-continuous casting, some of which were homogenized; however, non-homogenized samples were also analyzed. The tests of tensile strength for the 7003, 7003S, and 7010K alloys were conducted longitudinally and transversely to the casting direction.The tensile strength test for 7010 was conducted only transversely to the direction of casting. The aim of this publication is to present the results of strength test sand to show a correlation between the basic properties of 7xxx-series aluminum alloys; i.e., relative elongation E, yield strength YS, and ultimate tensile strength UTS.
所研究的铸锭由具有相似锆比的合金制成,通常为:EN AW-7010 [AlZn6MgCu]和EN AW-7003 [Al Zn6Mg0,8Zr],符合欧洲标准PN-EN 573-3:2014-02英文版。符号S和K是我们内部修改的,与标准兼容。添加锆的目的是提高塑性成型的抗拉强度和抗裂性。从半连续铸造的钢锭中取样,部分钢锭进行了均质处理;然而,非均质样品也进行了分析。对7003、7003S和7010K合金进行了纵向和横向的拉伸强度试验。7010的抗拉强度试验仅沿铸造方向横向进行。本出版物的目的是介绍强度试验的结果,以显示7xxx系列铝合金的基本性能之间的相关性;即相对伸长率E,屈服强度YS,极限抗拉强度UTS。
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引用次数: 0
RESEARCH INTO OXIDE INCLUSIONS IN SILICON BRONZE CuSi3Zn3MnFe WITH THE USE OF X-RAY MICROANALYSIS 用x射线显微分析研究硅青铜CuSi3Zn3MnFe中的氧化物夹杂物
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.41
R. Romankiewicz, F. Romankiewicz
This paper presents the results of X-ray microanalysis oxide inclusions in silicon bronze in terms of selection microadditions deoxidizers-modifying. On the basis of the oxides present in the alloy, it was found that the most appropriate microadditive is zirconium.
本文介绍了硅青铜中氧化物夹杂物的x射线微分析结果,包括微添加剂的选择、脱氧剂的改性。根据合金中存在的氧化物,发现最合适的微添加剂是锆。
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引用次数: 1
Al 6082 and Al 7075 alloys under the modified low-cycle fatigue test Al 6082和Al 7075合金的改进低周疲劳试验
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.57
M. Maj, J. Piekło
This paper discusses the possibility of assessing the quality of materials in terms of their mechanical properties as determined by a modified low-cycle fatigue test applied in these studies. The developed computer program adapted to the needs of an MTS universal testing machine is described, as are the details of an algorithm used by this program. The compatibility of test results obtained by the two methods (i.e., the standard low-cycle fatigue test [LCF] and its modified original version [MLCF]) has been demonstrated on the samples of selected non-ferrous metals alloys.
本文讨论了通过在这些研究中应用的改进的低周疲劳试验来确定材料的力学性能来评估材料质量的可能性。本文描述了为适应MTS通用试验机的需要而开发的计算机程序,以及该程序所使用的算法的细节。在选定的有色金属合金试样上,验证了两种方法(即标准低周疲劳试验[LCF]和改进的原始低周疲劳试验[MLCF])试验结果的相容性。
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引用次数: 1
COMPARATIVE ASSESSMENT OF Al-Si ALLOY GASSING DEGREE WITH THE APPLICATION OF THE ‘FIRST BUBBLE’ AND ‘SOLIDIFICATION UNDER DECREASED PRESSURE’ METHODS 铝硅合金气化程度与“第一次气泡法”和“减压凝固法”的对比评价
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.7
J. Zych, M. Piękoś, J. Kolczyk
All aluminum alloys in a liquid state are characterised by easy oxidation and absorption of hydrogen from the surroundings (which are the main reasons for casting defects). The amount of hydrogen adsorbed by a liquid alloy depends mainly on temperature and melting time. The performed investigations were aimed at comparing two known methods of measuring a metal gassing degree; the first bubble method and sample solidification under decreased pressure. Liquid metal melting and holding processes were performed under different conditions that caused variability of its gassing degree, resulting in a variability of purity and quality of the liquid metal. The investigations were carried out with using the hypoeutectic aluminum-silica AK7 alloy.
所有液态铝合金的特点是容易氧化和从周围环境中吸收氢(这是铸造缺陷的主要原因)。液态合金吸附氢的量主要取决于温度和熔化时间。所进行的调查旨在比较两种已知的测量金属气化度的方法;第一泡法和试样在减压下凝固。液态金属的熔化和保温过程在不同的条件下进行,导致其气体程度的变化,从而导致液态金属的纯度和质量的变化。采用亚共晶铝硅AK7合金进行了研究。
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引用次数: 0
Development of strength and electrical properties of Al-Si-Mg casting aluminum alloys with an Mg content of 1 wt% Mg含量为1wt %的Al-Si-Mg铸造铝合金强度和电性能的研究
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.47
T. Knych, J. Wiecheć, P. Uliasz
Silumins (i.e., alloys where the main alloy additive is silicon) are the largest casting aluminum alloy group. Materials of this kind are characterized by high strength properties, high corrosion resistance, and low density, which make it possible to use them for construction purposes. A new group of developed properties typical for casting silumins are electrical and thermal conductivity. Thermal and electrical conductivity can be optimized by the suitable selection of chemical composition of the alloy, in the process of precipitation hardening, or by means of a combination of both. The present paper includes test results of the strength and electrical properties of AlSiMg casting aluminum alloys. The alloys that were subject to testing were AlSi5Mg1, AlSi7Mg1, and AlSi11Mg1. Heat treatment included homogenization at a temperature of 535°C over a time period of 8 h, quenched, and artificial aging. The strength tests involved a Brinell hardness measurement as well as an electrical properties test involving electrical conductivity measurement tests.
硅合金(即主要合金添加剂为硅的合金)是最大的铸造铝合金组。这种材料的特点是高强度、高耐腐蚀性和低密度,这使得它们有可能用于建筑目的。一组新的开发性能典型的铸造硅明是电导率和导热性。通过适当选择合金的化学成分,在沉淀硬化过程中,或通过两者的结合,可以优化导热性和导电性。本文介绍了AlSiMg铸造铝合金的强度和电性能的试验结果。测试的合金为AlSi5Mg1、AlSi7Mg1和AlSi11Mg1。热处理包括在535°C的温度下均匀化8小时,淬火和人工时效。强度测试包括布氏硬度测量以及电性能测试,包括电导率测量测试。
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引用次数: 1
AN INTRODUCTION TO THE PROBLEM OF THE CONVERSION OF STRUCTURAL COMPONENTS, INCLUDING COMPONENTS MANUFACTURED BY CASTING TECHNIQUES 介绍结构部件的转换问题,包括通过铸造技术制造的部件
Pub Date : 2016-09-26 DOI: 10.7494/MAFE.2016.42.1.21
E. Czekaj, S. Pysz, A. Garbacz-Klempka, R. Żuczek
Modern development of technology features not only dynamic changes aimed at improving the performance characteristics of structural components through the optimum selection of materials, adjustments in design, or upgrade of manufacturing processes, but also the increase of the economic impact resulting from these changes. All of these processes occur under one common name of conversion and have a simple or – more often complex character (due to the vast scope of changes introduced). This article examines some basic definitions related to the concept of conversion and its association with innovative and intelligent solutions currently applied in materials engineering. Due to a variety of problems, attention was focused on the core notions related to conversion. Basing on our own experience (i.e., on the experience of the Foundry Research Institute and AGH University of Science and Technology in Krakow) and also on foreign achievements in this particular field of knowledge (mainly coming from the US), the most interesting examples of the conversion of materials and design (in the authors’ opinion) were discussed with reference to the methods of manufacture and possible interactions.
现代技术发展的特点不仅是通过材料的最佳选择、设计的调整或制造工艺的升级来改善结构部件的性能特征的动态变化,而且这些变化带来的经济影响也在增加。所有这些过程都有一个共同的转换名称,并且具有简单或更复杂的特征(由于引入的变化范围很大)。本文考察了与转换概念相关的一些基本定义及其与目前应用于材料工程的创新和智能解决方案的关联。由于各种各样的问题,人们的注意力集中在与转换相关的核心概念上。根据我们自己的经验(即克拉科夫铸造研究所和AGH科技大学的经验)以及在这一特定知识领域的国外成就(主要来自美国),讨论了材料和设计转换中最有趣的例子(在作者看来),并参考了制造方法和可能的相互作用。
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引用次数: 0
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Metallurgy and Foundry Engineering
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