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时间:2017-11-06 21:21来源:毕业论文
Abstract During the plastic injection molding process, one of the biggest challenges is shrinkage which deteriorates the quality of produced parts. To control and reduce this defect, the essential way is to perfectly determine the variables
Abstract  During the plastic injection molding process, one of the biggest challenges is shrinkage which deteriorates the quality of produced parts. To control and reduce this defect, the essential way is to perfectly determine the variables like molding parameters. In this study, the effects of molding parameters including packing pressure, melt temperature, and cooling time on shrinkage and roundness have been investigated experimentally. Also, the relationship among initial molding parameters, the cavity pressure, and mold temperature was investigated. The results of this experi- mental study and analysis fulfill various requirements of plastic injection molding and clarify the relationship between molding conditions and the overall quality of produced parts. This study illustrated that packing pressure and melt temperature are dominant factors which determine the quality of parts.14930

Keywords  Plastic injection molding . Molding parameters . Cavity pressure . Shrinkage . Roundness
1 Introduction

Plastic injection is one of the most considerable molding processes thanks to some significant reasons. The first important reason is that the use of plastic parts in daily life has tremendously increased in the last decades. For instance, most of the communication, electronic, kitchen, and daily consumer products are made of plastic materials.
 
Another remarkable reason is that plastic injection molding is capable of producing products which have complicated shapes, and different geometric aspects have perfect surface quality and restricted quality tolerances. Therefore, the expectation of this process is noticeable. In a plastic injection molding process, a significant task is to select initial molding parameters appropriately for producing high-quality products. Generally, the desired molding parameters are determined based on experience or by using a handbook. Yet, these selection methods do not ensure that determined parameters have optimal molding performance in particular in order to obtain parts with minimal defects. In  order to  determine the  relationship between  molding conditions and produced part quality, the researchers have been publishing many research results. 源自六{维"论:文}网.加7位QQ3249`114 www.lwfree.cn
According to Chang [1], the product quality of injection molded plastic parts is the result of a complex combination of the material used, the part and mold designs, and the process conditions used to manufacture them. Shrinkage is one of several important factors determining the quality of injection molded parts. Many factors, including materials, processing  parameters, and  part  and  mold  designs,  can affect shrinkage behavior. However, some research results indicate that the packing pressure is the most important process parameter affecting shrinkage during plastic injec- tion molding process [2–5]. Postawa et al. [6] presented the changes in shrinkage and weight of injection molded parts as a function of processing conditions. According to this study,  not  only  packing  pressure  but  also  injection
 temperature  has  considerable  effects  on  the  shrinkage
 
M. Kurt (*) : Y. Kaynak : O. S. Kamber : B. Mutlu : B. Bakir :
U. Koklu
Technical Education Faculty, Marmara University,
34722, Kadikoy, Istanbul, Turkey
e-mail: mkurt@marmara.edu.tr
 
behavior of  the  parts produced [7]. Delaunay et  al.  [8] have studied the influence of mold deflection on pressure history and shrinkage. They reported that the effect of mold deflection on shrinkage is ignorable. Wu et al. [9] focused on the influence of cavity deformation on shrinkage and
 
572    Int J Adv Manuf Technol (2010) 46:571–578
Fig. 1  Geometry and dimensions of the specimen
reported that controlling this parameter can decrease the shrinkage and overall quality of parts. On the other hand, Kazmer et al. [10] investigated multi-cavity pressure control in the filling and packing stages of the injection molding process. Their study showed cavity pressure to be a critical factor for the injection molding of high quality parts.  Bushko  et  al.  [11]  studied  the  effects of  process conditions on the shrinkage and residual stresses of thermo- viscoelastic melts between two parallel plates. Titomanlio et al. [12] investigated the influence of in-mold shrinkage on the dimensions and residual stress distributions of the final products. Angstadt and Coulter [13] investigated the relationship  between process conditions and  part quality in the injection molding process. 塑料注射成型英文文献和中文翻译:http://www.lwfree.cn/fanyi/20171106/15658.html
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