消失模铸造具有生产效率高、精度高、产品质量好、污染小等特点。本文将铝合金缸体作为研究对象，基于数值模拟软件ProCAST对缸体消失模铸造充型及凝固过程进行数值模拟，确定最优工艺方案，目的是缩短试验周期、节约生产成本、提高产品质量，从而指导实际生产。
发动机中最重要、最大的部分就是缸体。缸体结构很复杂、壁厚不均匀，是发动机生产中的重、难点，其铸造水平直接关系着发动机的质量。本文分析了缸体结构，设计了两种浇注系统：顶注式和阶梯注入式浇注系统。通过模拟这两种浇注系统的充型及凝固过程，对比流场和温度场以及缩孔缩松缺陷的预测情况，发现顶注式浇注系统充型时较为平稳，凝固时温度梯度小，分布更均匀，凝固速度较快，有利于减小热应力、细化晶粒，得到分布均匀的组织结构。因此顶注式浇注系统较为合理。
然后，本文通过正交试验的方法对浇注温度、模样密度、负压度和缸体缩孔缩松缺陷的影响关系进行了研究。研究发现：三个因素对缺陷影响从大到小依次为，模样密度、浇注温度、负压度。浇注温度为730℃，负压度为30kPa，模样密度为18g/L是铸件缩孔缩松缺陷形成倾向最小的组合。
因此，本文确定了最终工艺方案。对于铝合金缸体（ZL101）的消失模铸造，采用EPS（聚苯乙烯）作为模样材料，选取顶注式浇注系统，浇注温度为730℃，负压度为30kPa，模样密度为18g/L。
消失模铸造 EPC casting 铝合金 aluminum alloys 数值模拟 Numerical Simulation
充型及凝固过程 mould and solidifaction 缸体 cylinde block 浇注系统 gating system
顶注式和阶梯注入式 top gating system and step gating system 流场 velocity field
缩孔缩松缺陷 shrinkages and macroporosity 温度梯度 Temperature gradient
凝固速度 cooling speed 热应力 Thermal stress 晶粒 Grain
浇注温度 Pouring temperature 模样密度 Pattern density 负压度 Vacuum degree
EPC casting has such distinguishing features as high production efficiency，high precision，good product quality ,less polluting and so on.This paper will focused on the aluminum alloy cylinder , a numerical simulation will be carried out for the mould and solidifaction of cylinde block EPC casting ,based on ProCAST,a numerical simulation software,and a optimal process plan will be determined to shorten the test cycle, save production costs, improve product quality, so as to guide the actual production.
The most important and largest part of a engine is the cylinde block . Because of the complication of the structure and the uneven of the wall thickness of the cylinde block,this is the focus and the difficult part of the engine production, the casting of the cylinde block is directly related to the level of the quality of the engine.This paper analyzes the cylinder block structure, two types of gating system are designed: top gating system and step gating system.As a result of simulating both the filling and solidification process,comparing to the temperature of the flow field and the predict of shrinkages and macroporosity of the two gating systems,we found that top gating system is relatively stable when filling, solidification temperature gradient is smaller, distribution is more uniform, cooling speed is faster, is good for reducing the thermal stress, refining grain , geting uniformly distributed organizational structure. So the top gating system is more reasonable. Rearch
Then, the impact between temperature,pattern density ,vacuum degree with shrinkages and macroporosity of the cylinde block has been carried out in this paper.Studies showing:
three factors impact the defect in a decreasing order is density, pouring temperature, vacuum degree. The combination of the minimum propensity to form casting shrinkage and macroporosity is pouring temperature of 730 ℃, vacuum degree of 30kPa and pattern density of 18g / L.
Therefore, this paper determine the final process paln. For the EPC casting of the aluminum alloys cylinde block （ZL101） , we adopt the EPS (polystyrene) as the pattern materials, select the top gating system, casting temperature is 730 ℃, vacuum degree is 30kPa and pattern density is 18g / L.
PS 花了两小时，每句看过，希望有点用处。
The most important and largest part of a engine is the cylinde block . Because of the complication of the structure and the uneven of the wall thickness of the cylinde block,this is the focus and the difficult part of the engine production, the casting of the cylinde block is directly related to the level of the quality of the engine.This paper analyzes the cylinder block structure, two types of gating system are designed: top gating system and step gating system.As a result of simulating both the filling and solidification process,comparing to the temperature of the flow field and the predict of shrinkages and macroporosity of the two gating systems,we found that top gating system is relatively stable when filling, solidification temperature gradient is smaller, distribution is more uniform, cooling speed is faster, is good for reducing the thermal stress, refining grain , geting uniformly distributed organizational structure. So the top gating system is more reasonable. Rearch
Then, the impact between temperature,pattern density ,vacuum degree with shrinkages and macroporosity of the cylinde block has been carried out in this paper.Studies showing:
three factors impact the defect in a decreasing order is density, pouring temperature, vacuum degree. The combination of the minimum propensity to form casting shrinkage and macroporosity is pouring temperature of 730 ℃, vacuum degree of 30kPa and pattern density of 18g / L.
Therefore, this paper determine the final process paln. For the EPC casting of the aluminum alloys cylinde block （ZL101） , we adopt the EPS (polystyrene) as the pattern materials, select the top gating system, casting temperature is 730 ℃, vacuum degree is 30kPa and pattern density is 18g / L.
PS 花了两小时，每句看过，希望有点用处。
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第1个回答 2011-03-14
Epc has high production efficiency, high accuracy, good quality of product, less pollution, etc. This paper will aluminum alloy cylinder body as the research object, based on numerical simulation software of cylinder ProCAST epc filling mold and solidification process, a numerical simulation to determine the optimum process plan, the purpose is to shorten test cycle, saving production cost, improve product quality, so as to guide practical production.
The most important in the engine, the largest part was cylinder body. Cylinder structure is complex, wall thickness, is uneven in the production of the heavy engine, difficulties, its casting level are directly related to the engine's quality. This paper analyzes the cylinder structure, design the two kinds of gating system: top note type and ladder between gating system. Through the simulation of these two kinds of gating system during the filling and solidification process, contrast flow field and temperature field and shrinkage defect shrinkages predict situation, found that the top note type gating system when filling mold is more stable, during solidification temperature gradient is small, distribution, more uniform solidification faster, help to reduce the thermal stress, fine grains, get uniform distributed organization. Therefore top note type gating system is more reasonable.
Then, this article through orthogonal test method of pouring temperature, shape density, negative pressure degree and cylinder shrinkage defect shrinkages affects the were studied. Research found that three factors to influence from large to small defect in order, shape density, pouring temperature, negative pressure degrees. Pouring temperature for 730 ℃ vacuum degree for 30kPa, shape density for 18g/L is eliminate shrinkages shrinkage defect formation tendencies minimum combination.
Therefore, this paper determines the final process scheme. For aluminum alloy cylinder body (ZL101) epc, using EPS (polystyrene) as shape material, the selection of top note type gating system, pouring temperature for 730 ℃ vacuum degree for 30kPa, shape density for 18g/L.
PS：机译追问
The most important in the engine, the largest part was cylinder body. Cylinder structure is complex, wall thickness, is uneven in the production of the heavy engine, difficulties, its casting level are directly related to the engine's quality. This paper analyzes the cylinder structure, design the two kinds of gating system: top note type and ladder between gating system. Through the simulation of these two kinds of gating system during the filling and solidification process, contrast flow field and temperature field and shrinkage defect shrinkages predict situation, found that the top note type gating system when filling mold is more stable, during solidification temperature gradient is small, distribution, more uniform solidification faster, help to reduce the thermal stress, fine grains, get uniform distributed organization. Therefore top note type gating system is more reasonable.
Then, this article through orthogonal test method of pouring temperature, shape density, negative pressure degree and cylinder shrinkage defect shrinkages affects the were studied. Research found that three factors to influence from large to small defect in order, shape density, pouring temperature, negative pressure degrees. Pouring temperature for 730 ℃ vacuum degree for 30kPa, shape density for 18g/L is eliminate shrinkages shrinkage defect formation tendencies minimum combination.
Therefore, this paper determines the final process scheme. For aluminum alloy cylinder body (ZL101) epc, using EPS (polystyrene) as shape material, the selection of top note type gating system, pouring temperature for 730 ℃ vacuum degree for 30kPa, shape density for 18g/L.
PS：机译追问
谢谢您，但是这个好像不行，呵呵
第2个回答 2011-03-14
EPC with high efficiency, high precision, good product quality, pollution and so on. This article will aluminum alloy cylinder block as the object of study, based on numerical simulation software on the block EPC ProCAST filling and solidification process simulation, to determine the optimal process plan, the purpose is to shorten the test cycle, saving production costs, improve product quality, to guide the actual production.
The most important engines, the largest part is the cylinder. Cylinder structure is complex, uneven thickness, is the engine production in the heavy, difficult, and its level is directly related to the engine casting quality. This paper analyzes the cylinder block structure, two types of gating system design: top-note style and step into the gating system. Gating system by simulating both the filling and solidification process, compared to the flow field and temperature field and Shrinkage Defects Prediction and found that top gating system is relatively stable when filling, solidification temperature gradient is small, distribution is more uniform, solidification speed, tends to reduce the thermal stress, grain refinement, are uniformly distributed organizational structure. So the top gating system is more reasonable.
Then, this paper, the method of orthogonal pouring temperature, density, appearance, degree and cylinder vacuum Shrinkage Defects were studied. Found: three factors in decreasing order of the defect in appearance, density, pouring temperature, vacuum degree. Pouring temperature is 730 ℃, vacuum degree of 30kPa, look density 18g / L is the casting Shrinkage tendency to minimize the combination of defect formation.
Therefore, this paper process to determine the final program. For the aluminum alloy cylinder block (ZL101) EPC, the use of EPS (polystyrene) as the appearance of materials, select the top gating system, casting temperature is 730 ℃, vacuum degree of 30kPa, pattern density of 18g / L.
希望我的回答能为你带来帮助！这是我一个北外的同学给翻译的！
The most important engines, the largest part is the cylinder. Cylinder structure is complex, uneven thickness, is the engine production in the heavy, difficult, and its level is directly related to the engine casting quality. This paper analyzes the cylinder block structure, two types of gating system design: top-note style and step into the gating system. Gating system by simulating both the filling and solidification process, compared to the flow field and temperature field and Shrinkage Defects Prediction and found that top gating system is relatively stable when filling, solidification temperature gradient is small, distribution is more uniform, solidification speed, tends to reduce the thermal stress, grain refinement, are uniformly distributed organizational structure. So the top gating system is more reasonable.
Then, this paper, the method of orthogonal pouring temperature, density, appearance, degree and cylinder vacuum Shrinkage Defects were studied. Found: three factors in decreasing order of the defect in appearance, density, pouring temperature, vacuum degree. Pouring temperature is 730 ℃, vacuum degree of 30kPa, look density 18g / L is the casting Shrinkage tendency to minimize the combination of defect formation.
Therefore, this paper process to determine the final program. For the aluminum alloy cylinder block (ZL101) EPC, the use of EPS (polystyrene) as the appearance of materials, select the top gating system, casting temperature is 730 ℃, vacuum degree of 30kPa, pattern density of 18g / L.
希望我的回答能为你带来帮助！这是我一个北外的同学给翻译的！
